I have 3 PCs that desperately need a new OS. 2 run XP and one runs (horribly I might add) Vista.

My question is, what is the real difference between the 3 version of Win7? I plan on fresh installs, so I will get the OEM kits at newegg, not upgrades. There is very little info I have seen from MS on what the 'real' difference is on the different versions. I'm leaning towards the business (or middle one). The top end system just seems to have multiple language support - am I right on that?

Thanks for enduring my babbling...