well if you have a $150 budget I would really get a 4850. (technically the rebate might put you $20 over until it arrives). The 4850 is MUCH better with much more lasting power then the 8800GT 256mb. Also, depending on the accelero, it might fit on to the 4850 from what I have been reading (I don't know for certain, you'd have to check around here). Oh and I doubt you could get away with passive cooling on a 4850.