Maybe it's just me, but in any form having to worry about my iTunes window placement and app screen is a pain. It just seems so untidy. Just a personal opinion.
I have 4 desktops on my 1 monitor open at all times. iTunes tends to fill desktop 2 or 3 if I've only got Safari or whatever open. If I've got a load of stuff filling every desktop I close the iTunes window and use the function keys on my keyboard to flick through songs. With the little notifications that now appear in Mavericks it's made things a lot nicer.