Quote - I'm in the same boat.  I'm going to build a new pc and I'm hesitant to go with 64 bit.  I'd also like to hear some pros and cons.  I have XP Pro and I've tweaked it to a relatively rock solid state.  But...more addressable RAM would be nice!  :D

I am definitely going with 64Bit hardware.  I suppose I could get the retail Vista Ultimate and use the 32 Bit version for now.  I have been told that they also include the 64Bit version in the retail box.  I have been doing some research and it sounds like the Phenom quad core is going to fly when rendering; even in 32Bit mode.