Honestly speaking, you might want to think about a new optical drive...now, I'm not saying get a blu-ray drive, but a new DVD-Burner will almost certainly be much faster than an old one (if you have one)...and if you don't have one, they're pretty cheap.
Also, courtesy of Newegg.ca, you might think of a
Radeon 4670 or a
Geforce 9600 GT.
But, anyway...I'm really happy that Newegg Canada is up and running now! I don't know if it will have the
best prices you can find, but it always does here in the U.S.