Thanks guys,

Got my tent from ebay ($100, but I wish I'd paid a little more, it's not the best quality but i'm sure it'll do for at least a couple of grows) The air cooled light, fan and filter are from ebay too ($300)

I've been thinking about hydro for a while, I'll probably give it a try for my next grow. I've looked at the various systems and DWC, NFT, etc etc and would like to try Aero, from what i've read that gives the fastest growth. The one in particular I'm looking at is the Rainforest 66 it's just the right size for my tent and seems a good system.

As far as drawbacks/benefits I'm far from being an expert but in my humble opinion i'd list drawback as - not as forgiving as soil (any errors are more noticable), mechanical failure problems (if a pump goes down and you don't notice it very soon chances are your plants will die)

Advantages - Increased yield, reusable medium (no more buying fresh soil for each grow), semi automated (less time spent watering and feeding)

They're just what I can think of now and that's enough to convince me to give it a try but i'm sure there's lots I've left out.