if the new PC is for gaming, i will say get the b75. Because the b75 has PCI Express 3.0 x16 for the new GPU like HD7XXX or GTX6XX which is nice feature but don't get much more FPS (frames per second). But who know in future.
For the SSD, if you can get OCZ Vertex 3 VTX3-25SAT3-120G or Crucial M4 128GB within $10-20, because OCZ agility 3 120GB is slow.
You can only notice the different between the SSD on SATAII and on SATAIII in benchmark but not in real world.