Actually, the Noctua has apparently been whipped:http://www.xbitlabs.com/articles/coolers/display/thermalright-silver-arrow_6.html
but its still a great choice. However, if you're not pushing an overclock, no need to spend more money - the Hyper is much more than adequate.
I'd second Pizza's HD and RAM choices as faster and the right tweaks. 4 GB RAM doesn't sound like enough, right? 6 GB would satisfy, but its not a real option. So 8GB, yeah, probably.