Just a news item in case you've missed it:
Got other computers around the house that you'd like to upgrade to Windows 7? Probably the most economical way to purchase Win 7 Upgrades is the Family Pack deal, which Microsoft will once again offer for a limited time beginning sometime in October.http://www.zdnet.com/blog/bott/windows-7-family-pack-discounts-return/2380
Can't beat the price of 3 for $150--unless, of course, you don't need 3.
Now, even if you only need 2, $75/each isn't too bad of a price either.