I recently upgraded my system to a Intel Core i7-2600k 3.40GHz with 16 gigs of ram - and best of all, a 240 gb SSD..
The speed this SSD provides along with the rest of the setup is insane.
Starting up CS5 with everything full loaded = 5 seconds.
Any browser = less than a second.
If you dont have SSD .. and maybe not even know what it is.. this is the time to find out.
http://www.amazon.com/OCZ-Technology.../dp/B003OBZ9IA