Current PC Specs:

There's two things I want to do with my computer:
Replace the PSU
Get new graphics card
Currently I'm looking at this:
http://www.ebay.co.uk/itm/EVGA-GeForce-GTX-960-FTW-ACX-2-0-graphics-card-GF-GTX-690-2-GB-/131618133029If anyone knows a cheaper version with the same power or higher, post.
If anyone thinks this may not work with my current build, post.
For the PSU, I'm not sure. If anyone knows stuff about stuff and could get me a PSU that works at a low price that is compatible with my current build with new GPU, that'l be great
I need to replace the PSU because I think my current one doesn't have enough power to be able to handle everything in my computer, it frequently reboots due to power surges.
That could also be because of heat, but I recently got a new fan and it has improved, yet the computer still reboots occasionally.