This is very dependant on what your priorities are. You want to put your money where you spend your time. If you play games ocasionally then you should go for more prossessor and less gfx card. If you play games alot (or you want your games to run at the best settings and fps') then you should shave on the CPU and put more into your gfx card.

My advice would be this: You play games, obviously, so when you play you want the best experience possible. Get 2gb of good ram the e6400 and the best gfx card you can afford. You wont notice a big difference in everyday computing with the better processor but you will notice a good difference with the better gfx card.