STRONGLY agree-get the Radeon 6750 graphics processor. I have the Intel 3000 (only) one, and there are 3 problems with it.
1. It doesn;t have dedicated graphics memory-and on a laptop, theres no way to add or change that.
2. The Intel 3000 has just barely enough grpahics power to run sl-noticeable difference (BAD difference) betwen the Intel 3000 and a THREE YEAR OLD Macbook Pro with low end graphiocs processor-the 3000 system rezzes things MUCH slower.
3. It comes with LIon (10.7). This seems to be a temporary problem-SL never seems to notice when a new Mac OS is released until waay after its been out-they say Apple doesn't have good drivers (somewhat true), Apple says SL needs to program for what Apple makes if they claim its "compatible"-since its no mystery what harware they have-also true. And after awhile, upadtes come out and it works fine. SHRUG.
I know, this is all geeky talk, bottom line, the Radeon discreet graphics system is WAY better for SL and all graphics "stuff".
In my opinion, the faster drive won't help you with SL, although it is very nice. : )