Will this run okay under an intel atom processor?
Yes it should run fine however I suggest you test it using the demo. Some of the features might not be usable but it also depends if you are using an SSD drive and what display adapter you have along with memory and O/S.
I would have thoughts windows 7 with an SSD and NVIDIA graphics should be fine.
I have one running with the atom but you do need to turn down some of the animations.
I have yet to install my SSD and PNG which should improve things.
I am particularly looking for as small a PC footprint as i can get away with, using old jukebox cabinets (NSM)
What do you recommend?
I'm pretty sure thinking about it that the PC in the bar is a Compaq SFF with a Pentium 4 CPU and a radeon agp card.