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The reason CyanogenMod on the Vibrant isn't completely stable is because of the way Samsung designed the bootloader and some of the drivers. The devs have had to do a lot more hacking than is usually required. Honestly, it's still pretty stable, I'm using it as my daily driver right now.
If you don't want to try that, than just give it a few days. The international Galaxy S just got Gingerbread, and devs are working right now to build ROMs for the US variants.
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Not that I've seen, but I'm not a gamer. If it doesn't work, you can always go back.