I would go for a cheaper motherboard, the Ultra-D would be fine for clocking to a decent speed. This is of-course if you don't want/need SLI functionality.
Like people have said, 2gb of Geil RAM would net you more ppd than 1gb of faster RAM.
Try and get a better graphics card second hand somewhere for a similar price, the 7300 won't perform too well in games. Try and get a 6600GT or something like that.
The Arctic Cooling Freezer 64 Pro is very good for the price, although you could get anything really, look for reviews though before buying something that's silly cheap.