hi guys! i'm planning to buy xbox360 with kinect. need your expert advice. i want to buy because the major attraction is dance central. some questions i want to ask

- what region console should i choose?
- what's the difference for asia / us region game? asia is cheaper but what it lacks? do some game only exists in us region?
- if i dl song for dance central or other game, is it region based?
- how much the range a kinect 250g xbox cost? don't want get chop:) is 4g console convenient to play?

thanks:)