Home Basic vs. Home Premium:
No Aero interface, including transparency in many parts of the GUI (worth having -looks nice speeds up drawing/lowers cpu load)
No Media Center (worth having as it's pretty good)
Five included Windows games, instead of nine (irrelevant to you)
No automatic network backup (irrelevant to you)
No relationship between PC and Xbox 360 (?)
No advanced slideshows (big deal
lol!)
No Movie Maker / DVD Maker (might be handy)
Weak Tablet PC functionality (irrelevant to you)
No SideShow Support (might be useful one sunny day)
Home Premium vs. Ultimate:
No advanced complete system backup tool (you can buy one seperately though)
Small business apps, such as Fax and Scan (useless)
No Ultimate "extras", which could include games and special utilities (but more or less doesn't - extras are worthless)
No BitLocker hard drive encryption software (not necessary)
No automatic "Shadow" copies of your documents (nice, but not earth shattering if you backup anyway)
No Remote Desktop (you can hack premium so it does)
No advanced group policy editor (irrelevant to you)
Inability to run UNIX-based applications (through SUA) (irrelevant to you)
No support for dual CPU's (2 physical processors) or 128GB of memory (irrelevant to you)
Which one to get? Home Premium offers the best balance of features/price
IMHO.
Ultimate is a waste of dosh for most.