The OP said "should I upgrade those too?" Now, maybe I misread things, it was early and I got a bit less sleep than usual, but I was taking that to mean the OP was asking about upgrading the RAM and graphics card.
I will say upgrading RAM is never, well almost never, a bad idea... But it's really rather amazing what OS X can do with just 2GB of RAM. My workstation/server (original model Mac Pro) at work only has 2GB of RAM, still seems faster than my 2010 i7 iMac with 12GB of RAM at times.
So to the OP I'd say upgrading RAM, regardless of the OS, wouldn't be a bad idea... HOWEVER, if 2GB is doing it for you presently, and money is a bit tight, then don't worry about it. If you can swing the cost of an extra 2-4GB of RAM, then by all means go for it. But maybe wait until after you've recovered financially from any holiday shopping you've done/will do. There will never be a shortage of deals on these things, holiday shopping season or no. It's probably about that time again when the RAM manufacturer's get busted for price fixing and the price on RAM drops like a stone anyway. Happens almost like clockwork every couple of years.
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