Windows 7 Home Premium SP1 64bit (Full) System Builder DVD 1
http://www.amazon.com/gp/product/B004... Windows 7 Home Premium SP1 64bit (Full) System Builder DVD 1 Pack (DVD-ROM)
This was the most affordable Windows 7 that I found that I can use to install on my Macbook Pro through Parallels 6. At first I was debating on going with the 64bit or the 32bit, because some software do not work on 64bit. I ended up going with 64bit -- those non-compatible software should update, not me.
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