If I were building a gaming rig I would use
64bit professional
In Europe the price difference between
Premium and professional is about €40
On a gaming rig costing upwards of €1000 it adds little to the overall cost and it
Is nice to know if I decide to pull out an old game I can play it.
But from a gaming point of view XP mode is the only benefit of professional
Is that worth €40 to you?
If not go with premium