Keep the CRT though, I have one of each (CRT and LCD), prefer the CRT to be honest.
http://gnomonology.com/ - you can order a lot of gear from there. I got three custom DVD’s full of assets (textures mainly) and tutorials on scuplting, modelling, etc.
http://www.ballisticpublishing.com/books/essence/face/ - all about human heads/faces/eyes etc for 3D. Mainly focused on texturing and rendering, but there is modelling stuff. There are a lot of books by Ballistic Publishing that are quite good. Perhaps get one of the digital art ones for inspiration. A bit pricey if money is tight though.
Mancandy FAQ is a must if you are wanting to get into rigging - own it, love it.
An anatomy book. http://www.amazon.com/Anatomy-Artist-Sarah-Simblet/dp/078948045X is probably the best one I’ve got, although a cheap one to get you started would still be handy. Picked up a book full of Leonardo DaVinci’s anatomical studies for under $20 once. Helps amazingly with character proportions, even if you aren’t going for realism.
http://3d.sk/ - many photo reference sets, via membership
http://market.renderosity.com/mod/bcs/index.php?vendor=levius - a fair collection of the same references, but for individual sale. Weigh up how many you want and which is cheaper for you.
A wacom tablet does wonders for both texturing and sculpting. Not neccesary, but you’ll wonder how you ever put up with a mouse if you get one.
For the record, this is stuff I own personally and I can say has improved how I work as an artist. I have other stuff too, but either I haven’t tried it much or I didn’t particularly need it.
This might make a good sticky if we get a decent list happening.