All proccys come with HS now days so no need to worry about that..and if you are not planning on a GPU, there is a huge difference in performance between the non AMD chipsets ie 790gx/fx 780 gx and nvidia chipsets.
AMD chipsets are way better for onboard video as of now.
Well, I don't know about the past. But now-a-days, every processor (legal ) come with HSF. I bought a X2 550 black edition and it has a cute little HSF,
Yes, That’s a good choice of MoBo and is a good pair for the 7750 proc. The MoBo also gives DVI-D video interface, gigabit Ethernet,6 SATA ports and 10 USB slots (4 at the back and 3 headers that can provide 6 slots) 4 RAM slots supporting up to 16GB and also a PCI-E x16 slot, so that’s a plus if you’d want to upgrade later.