The HD7770 is not a bad card, by any means, but, even at your resolution, would be limited in some games. You don't give any prices, so I don't know what, if any, spare you have in budget. If you have a little spare, something like a GTX 560, or a HD 6850 would give a better performance, worth a little additional cost (of course, depends what actual prices you can get).
Are you planning to overclock CPU? Don't forget aftermarket cooler, if you are.
Not familiar with Foxconn mobo (in UK), so can't comment on that.
320gb ssd? If you don't already have that part, I don't know of any way that will fit in your budget. A ssd of that capacity tends to run at *least* $225 by itself.
If you do end up purchasing around sept. 30, you could save a bit by going with the fx-4100 instead of the 965. The 965 is ever-so-slightly-faster, but the price on the 4100 will be dropping by $10 due to the 4130 launch yesterday.
Other than that, the 7770 will handle 1366x768 easily.