Can I answer none of the above? Either CPU will be great in any game you play, and either 8800 will power everything including a 22" monitor. Your bottleneck will happen because you only have 1 gb of RAM.
Were you open to overclocking? O/C'ed e4300 can run faster than a stock e6600. Still either will run all your games stock. To throw one more small item into the mix, if you do not want to overclock, you can save money running a AMD rig.