since your video editing i presume you need a fairly large hard drive
i suggest the 7200.11 500gb or 1tb
and make sure you get a 64-bit operating system for your 4gb of RAM
I can't afford $1,000+ programs, and I am completely against pirating. So a)I won't be needing 4 GB of RAM, and B) I don't want to drain cash on a brand new OS. Basically, my computer right now (Athlon 64 3000+, 1 GB, radeon 9550) can still easily run my editing program and store footage. But for the future, I'll need something better, in addition to a new program.
Are 4 GB/a new OS really necessary?