Asus GTX760 2GB:
http://pcpartpicker.com/part/asus-video-card-gtx760dc2oc2gd5
Sapphire R9-280X 3GB:
http://pcpartpicker.com/part/sapphire-video-card-100363l
Power Supply:
http://pcpartpicker.com/part/corsair-power-supply-cx600m
POINTS:
1) There are Pros and Cons between the AMD and NVidia choice:
AMD:
- 3GB vs 2GB (more memory not currently an issue, and at this level probably won't be)
- Mantle support (only a few games coming, though if if Mantle support works okay will alleviate some CPU bottleneck)
Nvidia:
- PhysX
- Shadowplay (desktop/game streaming/recording. Efficient due to the NVENC hardware encoder on the new NVidia cards)
- G-Sync monitor support (you probably don't care)
POWER SUPPLY:
The above Corsair is a modular PSU with fairly good customer feedback; seriously 267 people gave it a 4.7/5 on average. You may find a similar PSU you like better.
*CPU bottlenecking:
Yes, you absolutely will get CPU bottlenecking in some games. While I wouldn't "worry about it" since you can't do anything about it, you will still get a lower FPS in some games than you would with a good 4-core i5-4xxx CPU.
For example, in Battlefield 4 your CPU will be a bottleneck in Multiplayer. I also wanted to mention Mantle support for BF4 sucks. They just did a review and found out you get issues unless you have a 4GB video card. That's just growing pains of the technology but unless they fix it, I don't recommend using it to help alleviate CPU bottleneck.
This is with a GTX780Ti so it's not completely representative, but here's an example of a game that you'd be bottlenecking a bit on your CPU with the GTX760:
http://www.tomshardware.com/reviews/watch-dogs-pc-performance,3833-8.html
If it was SKYRIM then your CPU would do quite well. A slight bottleneck yes, but probably no more than 20% so a solid 60FPS experience is feasible.
Cheers.