Relying solely on lights - advice for my next setup?

[calvin_orchidL]

yeah I thought I'd seen her around here

Okay I'm seriously considering a 4ft 4light T5 setup, but I've looked around (Ebay etc..) and I notice that there is quite the range of pricing. For instance, our local hydroponics shop sells them for 400 dollars, specialty lights sells them for 250, and on ebay I see them for 150!

I feel like somehow the fixture varies between brands - Ross you recommended NewWave - why is this one better? I saw some site (can't find it now) that said Tek is the best, but the ebay seller is selling the 4x4 Tek lights for cheaper than the new wave ones .... I'm really confused

Any help would be appreciated!