What part of my computer should I upgrade first?

Ok 1st have you defraged your hard drives.......Have you fixed the registry.....do you have something to speed up the pc......defrag the registry....is the page file set right or high enough......defrag the page file........Task manager will tell you if you need more ram or change the page file size......Your specs are good but if you must upgrade check out www.geeks.com they have just about everything for computers and are really good on prices..........Well good luck and I hope this helps...........