One thing people have not mentioned about OEM's is the warranties. Sometimes the warranties are much shorter on OEM products versus the retails. On Newegg for instance I think the OEM processors only have 30 day warranty versus the typical 3 year warranty that retail processors have (someone can correct me on this if I am mistaken).
Also I would recommend NOT spending a lot of money on fancy ram... but rather getting a gig of budget ram from Corsair. Here is some for a decent price
http://www.zipzoomfly.com/jsp/Produc...80098-6&ps=ho1