Yeah, 120ghz is so fast, it's like...out of this world. LOL

as fast as you can afford ... they seem really slow in about 6 months ... so the faster the better!

That should suffice. If you're doing large amounts of work in photo shop and other RAM requiring applications, up your RAM. It's cheap. Like everyone else has said, it just depends. Hard drive space is crucial. If you have less than 40 gig, consider purchasing an external hard drive and move your files over to it. It'll speed things up a bit and also give you the convenience of traveling with all your data.

as cheap as new pcs are, dont waste money upgrading. The older ram gets more expensive, not less. Apply the upgrade $$ to a new purchase and your almost there.