Motherboard and CPU bundles?
Your going to need a bigger budget to include a video card. The fatal flaw in your plan is that pretty much any mother board is going to have horrid integrated graphics. A top of the line Intel Ivy bridge might be passable, but I wouldn’t recommend for anything high resolution.
Add memory to your list, you have a core2duo so it’s probably ddr2 you have and you’ll need ddr3 for a Sandy or Ivybridge CPU & Mobo.