Here´s one test. I just tried those lamp-settings and found couple of things that I didn´t know yet. This is just a humble experience, but that doesn´t mean that you cannot give me crits and comments :] and I don´t know is that night or day.
Nice, did you use blender’s greeble script for creating city scapes?
Script, yes. Greeble, no. I used discombulate script for the first time… Thanks for the comment 
Yeah that’s what I meant, but I couldn’t remember the name.
Ha, I might try the discombulate script with an indigo render tomorrow. It’s on my things to do list.
ok Have you tried that indigo yet?
Yes I have. Do you even look at the other posts? 
http://blenderartists.org/forum/showthread.php?t=82692
The buildings aren’t as tall as yours but if you like I can change the settings on the discombulator and render another in indigo.