Thanks I will do it at 4 gigs of ram.
Crucial has 4 gigs for $30 US, but 8 gigs is only $46 US. I'd do the 8 gigs.
You will be removing the two 1 gig chips that come with it and putting in two 4 gig chips.
It's really easy to do, the bottom plate pops right off. Don't buy it through Apple or whoever you get it from, go with Crucial. Apple wants $100 for 4 gigs, and $300 for 8 gigs, ridiculous.