Triple Cores are kind of like the AMD chips no one cares about lol.
If your going to get an AM2+ chip why not a quad? Since the 9600 Phenom is like $120~ anyways.
Newegg.com - AMD Phenom 9600 Agena 2.3GHz 4 x 512KB L2 Cache 2MB L3 Cache Socket AM2+ 95W Quad-Core Processor - Processors - Desktops
Or go with the E5200, you should be satisfied with both. The 9600 will handle multitasking well. While the E5200 will overclock as far as 3.5ghz stable 24/7.