you mobo is limited to sata 2 (3gb/s) so any hdd/ssd will also be limited to that. you need a sata 3 (6gb/s) controller to run your drives at 6gb/s and yes you should upgrade to a sata 3 capable mobo! here is a great one with overclocking ability and sata 3 controller
Price breakdown by merchant:
http://pcpartpicker.com/p/zWWsXL/by_merchant/
Motherboard: Gigabyte GA-970A-UD3P ATX AM3+ Motherboard ($73.98 @ OutletPC)
Total: $73.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-08-06 10:34 EDT-0400