I'm torn on what to do. I have 3 PCs, but have Vista Ultimate on all 3. From what I read, I should proably consider at least the professional. But maybe I need to read more 
In particular, I want to be sure it will run all my apps, and do the backup in particular. When I look at teh edition comparison at Microsoft, I see this for Professional: "
In addition to full-system Backup and Restore found in all editions, you can back up to a home or business network." I do differential backups nightly to a server, and this implies to me that the premium would not allow this
Upgrading 3 to Pro is expensive enough that I'm not sure I want to make that expenditure.
[EDIT]
Oh, also, I want to do remote control to the PCs. I'm thinking I had read that rquired PRO as well.