I am trying to figure out which processor would be the best fit for my use and MoBo...

I no longer play high end games on the PC. I mostly use it for web design, photo and video. Some editing. I selected this MoBo due to it's slots. As you can tell, I fill almost all of them currently. I am not sure if I will Overclock unless I will see a bump in preformance in none gaming apps.

From researching, I narrowed down to either an Intel Core 2 Duo E8400 Duo or Q9650 Intel Core 2 Quad. As with most, money will limit my purchase. Currently I talking two a few people whom have used CPUs for both. E8400 is around $100 and Q9650 around $200 used. The E8400 is well within my budget but I am wondering if I should save up for the Q9650 or similar Quad that I can afford at a later date.

The Pentium D is running just fine for me now, I pulled it off an old machine to run the system until I could figure out what processor to upgrade to. Any advise?

Thank you in advance!!!