ultimate is worth every penny...but only buy what you only want
Windows Vista: Compare Editions
You'll be satisfied with either...just get your drivers in order
That is basically, looking at what you are getting, knowing and buying. Don't assume too much from Ultimate and you'll be satisfied. Some people wish they could get more freebies, but eh, doesn't bother me.
And don't believe the hype, Ultimate does not "TIE" up any more resources. It makes use of things that are often not. Think of it like exercise.
at newegg, the 64bits are 190 and 112.
upgrade path will cost you about 150 I believe, if you decided to.