There's usually a good deal on RAM at CompUSA, and you could probably get a good price at the Best Buy up there.
I've noticed a definite speed increase. The only problem I seem to have is with ads through ad.doubleclick.net, since my ISP blocks them and it sometimes makes the whole page loading hang. Diagnostics runs on my end show almost no lag from EN World in initial response, with only a few seconds of time while the system handles the payload of a couple thousand registered users accessing the site all at once, and then a speedy transmission of data. Mostly it's the posts and searches that bog down sometimes, but more RAM should fix that up.