I just got the 160GB Intel, and I have to say I like the extra space. I've installed a bunch of games on it and it's already up in the 40GB full. You can do some things to reduce the Win7 footprint (disable volume shadow copy, hibernate, pagefile (controversial, but the expert consensus seems to be to leave it in)). But so far, I love it, everything in the OS is a lot snappier. Even stuff like the Windows options menus open faster. Search is faaaaast, especially since I keep the index on the SSD, although that is another space killer. Overall fps won't make any difference, but min fps will show some slight improvement (before anyone jumps on me, that improvement only shows up in some games on really high settings, when it looks like the game is cranking the HDD trying to load textures and stuff on the fly).
Overall the review consensus seems to be that the Intel rocks on the random reads/writes, which is where the snappiness comes from, but the OCZ, etc are close in performance but cheaper. All the current gen SSDs are so far ahead of HDDs, the performance differences you see are probably pretty academic. The Intel Drives do seem to have better feature support, for things like TRIM, etc. and the 160GB has some features the 80GB doesn't, but again, that's all probably academic. In retrospect, I would probably go with the OCZ type, not the Intel, since they are close enough in perfmance, and all this stuff will plummet in price in a year anyway.