These days getting huge systems isn't as good as it used to be. Correct me if I'm wrong but the buy back price is equal to the sell price, hence getting a decent 1.5kw system (as thats where most of the rebate goes to) makes more sense I reckon.
On that note, anyone can hook me up to a good 1.5kw system, I will install the same system on 3 houses and pay in cash (if that helps)