Another thread for me…
I recently bought a Notebook and had the exact same troubles you have, so i share my wisdom because getting a notebook is like deceiding to build a house or buy a new car or deceiding to replace the slippers you had the last 10 years… maybe 15 lol
IMO the whole Netbook stuff is going the wrong way.
Seriously the Intel atom is a nice toy, but thats all it is. It lacks performance you cant really work with it. So basically a netbook for me is:
Atom platform, SSD/Flash, energy saver.
Now the companies all start to put as much stuff into them as possible… real HDD, better graphics, biggest screen possible and so on… so the power consumption goes up and the machine is too slow and too small to seriously work with it.
A netbook is a toy you use in the park, or on the couch to write some emails, check your forums, do some webshopping or write a small text and do some IM. But thats it.
So i was starting to look out for subnotebooks. Sony, Samsung, HP. Not real bargains.
So finally i came back where i started, Dell.
I got a Dell Vostro 1310 for several reasons (notebook reasons):
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Processor T8100 with 2* 2.1 GHz and 3GiB cache… fast as hell on rendering and compiling stuff
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dedicated GeForce 8400 GS (256MiB) very good OpenGL card and just fits the screenresolution to be even able to play actual games and not part of the latest incidents with dying nvidia notebookchips (only the 8600 series was affected)
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320 GiB Sata HDD - yeah, enogh space for video compositing, vast SVN repositories and lots of ebooks
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4 GiB DDR2 - well you can replace RAM only with one thing… more RAM 
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intel Pro wireless - i chose that one to make the machine 100% linux compatible.
+13.3" 1280x900 - i consider that size still handy to carry it around everywhere and the screen is decent enough for graphic work.
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56 VA batteries - under real working circumstances (graphic usage, wlan on …) it lasts around 3-4h, when i go to powersave and do just some surfing, or turn off wireless i last up to 5-6h
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100% linux compatible. I am running debian64 on it and it works like a charm… almost instantly out of the box. i had some work implementing the right firmware for the wireless and compile a nvidia kernel module but thats all.
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option to get it with windowsXP (32 professional though) along with vista upgrade media.
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dell 24h repair service
but no notebook only has pros, i also encountered some things i did not like that much:
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buisiness notebook with a glossy cover? Sure it looks awesome in its black&glossy outfit, but you get scratches sooo easy in the cover… not the best choice by dell.
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u need some time to get used to the changed keyboard layout, the “<|>” is where the “-_” is normally on a keyboard and the made the right shift shorter… strange but well.
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THE speaker (yes only one) is real crap. but its no MM notebook its made for work… the soundcart is some realtek, has a decent sound though.
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only a slot-in optical drive, but u only need it when installing something from CD
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the cooling fan is a bit loud but i am cool with that. the vostro is known to be one of the best cooled notebooks. the underside is covered with heatpipes. the fan turns on for 10 secs and then its silent again for the next 30mins or so. depends on the duty of the processor… cool notebook = long life 
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no pixel guarantee upgrade at dell. if you got faulty pixels thats the way it is.
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IMO the notebook could be smaller for 13.3" but i rather like a good keyboard and a nice touchpad,
For work i bought myself a USB numpad for a few bucks, if you are used to use it with blender its not replaceable by anything else 
The best thing about the notebook is the price. I assume that you (Ben) can also buy it taxfree over your company. Taxfree and with some usual Dell bargains i paid 600Euro/ 800USD/ 1215AUS which is really cheap for the power you get.
Yeah and i know you only want to spend 500-600AUS, but i rather get something you can actually work on and have some fun with for more than a year or so
At least that was one of the final reasons i deceided against a netbook.
I will run the BBB benchmark and the renderbenchmark later on the machine and post up some results if you are intrested.
HTH 