I agree that it would be best to spend the extra $35 on the HD 7750. Power draw is very similar and performance is significantly improved. Unless space is a bi factor, it's definitely the way to go. Also, just to give you an idea as to the actual power draw of your setup, I doubt it will pull over 250w. That Athlon II X3 won't pull over 100w at stock, a 785G chipset board pulls about 25w, and the HD 7750 pulls around 65w max. A TV tuner is usually around 30w.Things like RAM, optical drives, and hard drives will not likely exceed 30w altogether, and they pull power off the lesser used 3.3v and +5v rails (most everything else uses the +12v rail). That's 220w in an extreme worst-case scenario, with most realistic numbers being well under 200w, plenty safe for a reasonable quality PSU like hat Antec you have.