I often advise clients on computer configurations for new purchases. I now see that Vista 64 is becoming more prevalent in commodity desktops. My choice is to go with the flow and expand available choices, limit the scope to Vista 32 OR insist on XP.
I can find machines in any of these categories but Vista 64 machines are more immediately avaialbe off the shelf.
I'm a bit reluctant to go to Vista 64 because XP 64 has been a rarity with (I believe) scarcity of drivers and other compatibility issues due to it being in a limited market. Yet, XP 64 wasn't ever produced in what appears to be the quantity/popularity of Vista 64 from the big producers today.
The current users aren't going to be doing much in the way of sophisticated installs, apps, etc. I just don't want to steer them into a dead end.
What is your advice? Why?