I'm wondering why Vendors are bothering to offer more ram (There's 8Gb available over at Evesham).
Vista will use it all.
If I opted for a 64 bit PC will all my hardware, software work okay? And will my computer be slower than a 32 bit PC?
Now thats a good question, with very little 64 bit software written and 64 bit drivers hard to come by I personally wouldn't bother (I am currently running 32bit XP on a 64bit chip).