That motherboard does not have PCI-E 3.0, just 2.0 which will mean you won't fully benefit from a highend card. It also only has Sata 3GB/s connectors, thus limiting you a bit on the hard drive selection
PCIE3 has a lot less impact than most people think. Especially not when looking at mid range cards like a 7850.
HDD wise depends on what you want to achieve. I prefer the SSD/HDD combo and have done this with all of my builds as of late. Sweet point for me personally is 128gb($80 on sale) SSD with 2tb+ HDD ($100). But that's almost $200, so budget would matter.
If I had to choose one or the other, I'd go with a 2tb seagate 7200 rpm drive, since I need quite a bit of space.