Want to buy: - Windows 7 Professional - Preferably Retail
The title says it all really!
I'd prefer Retail because I might upgrade my PC in the not too distant future (or it might break on me!) so it would be good to have a licence key I can transfer and use on a new machine.
Also, all the different options available on places like email confuse the hell out of me! So I thought buying Retail - so long as it is genuine - would be the easiest option.