64 bit is the way to go because:
- drivers, software AND hardware are being designed primarily for 64 bit now. This means that 32 bit support may actually grow worse (while it was the opposite a year or two ago).
- 3GB memory is nothing when it comes to modern games and that's all you'll get with 32bit Windows.
Yes, you lose 16bit support but that's it unless you got outdated hardware with poor 64 bit drivers. And let me tell you, only pre-3D card games use 16bit anyway meaning you can just use Dosbox or Virtual Machine to run the few games that won't work properly.
If you don't have to change, don't, but for top end games, there's already a very noticeable difference in performance. Heck, I'm going to switch to 8GB soon (Vista precaches meaning it will load practically any program instantly) and with memory being dirt cheap at the moment, it can only be a good thing.
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