Heh...if you dont like Vista you can always reformat and install XP.
Personally I wont bother to upgrade for another service pack or two. Too many horseflies...(yes horseflies!! they are too pasky and big to be just considered bugs

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Considering XP only recently went to SP3, you may have to wait another 6 years for Vista SP3. By then we'll probably be having this same conversation about Windows 8 (Vista being Windows 6).
By the way, what bugs are you talking about? From my 18 months of experience with Vista, it doesn't appear buggy to me. The only ones I've really had to deal with were some of the multimedia bugs, but most of those were resolved with updated video drivers, Codecs, and a couple hotfixes (the hotfixes and video drivers were required by XP as well). I have it on 2 home computers (Ultimate) and 4 work PC's (Enterprise) and none have suffered any kind of Blue screen...ever. The only time I restart them is when I install a security hotfix. Other than that, they run 24/7 (usually in sleep mode when I'm not using them). Vista is a smidgeon slower on older hardware, but so was XP when it came out in 2001.
Also, please remember...even at the age of 7, XP still has bugs. An average of 4 or 5 security patches come out every month for XP, and numerous bug hotfixes are available.
So I have to say I'm very satisfied with Windows Vista though I see no reason to upgrade a current system from XP to Vista.