For my team, I purchased LED strips and Cold Cathode lights, both of which run on 12v. LEDs don't draw very much power, although the CCFL's do add up. I would reccommend keeping the number of CCFLs to a minimum, and also know that if you try to lengthen the wires from the transformers to the lights - you will lose brightness significantly.
I order my LEDs from
http://www.superbrightleds.com because they are based in the USA and ship darn fast via USPS. Prices are more than dealextreme.com, but from my experience, most of what dealextreme sells is shipped from China - I prefer to buy USA made.
Best of luck,
AJ