Need to decide what video card to get for my new set up

Your motherboard is a 970 chipset proprietary board. It has a single PCI-E 2.0 slot for graphics and your current PSU is a standard sized 300w OEM.

You will have a problem with the PSU as it isn't a standard sized PSU and the 660ti requires at least 400W.
 
Well you misunderstood me. The PSU that is in your case isn't the standard size so getting a regular PSU wont fit. Also 750w is way overkill for the 660ti.
 
Power Supply
Internal 300W (100V-240V)
Form factor: Internal ATX
Total wattage: 300W
Nominal input voltage range: 200-240V/3A (50-60Hz)
Dimensions: 150mm x 140mm x 86mm (5.9 x 5.5 x 3.4 inches)

the power supply looks to be the standard ATX.

don't know how much you want to spend, but these should work fine.
Newegg.com - OCZ ModXStream Pro 600W Modular High Performance Power Supply compatible with Intel Sandybridge Core i3 i5 i7 and AMD Phenom
Newegg.com - Rosewill HIVE Series HIVE-650 650W Continuous @40°C, 80 PLUS BRONZE Certified, Modular Design, Single +12V Rail, ATX12V v2.31/EPS12V v2.92, SLI Ready, CrossFire Ready, Active-PFC Power Supply
 
Look at the dimensions of his PSU vs another one. The height is more than a usual PSU due to the fan size. Google image search his PC model and look at the rear of the PC.
 
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