Need an advice about new gpu.

[geogamerboy]

I want to get a new gpu and can spend 250-300$ on it. Can you recommend me best ones with this price? Also I have 400W power supply and Asus P7P55 LX motherboard. Will I need to change something of those?
I heard gtx 760 is really good(true?).
so which would be better?
http://www.amazon.com/Sapphire-DL-DVI-I-SL-DVI-D-PCI-Express-11197-03-40G/dp/B009B6Y01Y/ref=sr_1_2?ie=UTF8&qid=1376911810&sr=8-2&keywords=hd+7970

or
http://www.amazon.com/EVGA-SuperClocked-Dual-Link-Graphics-02G-P4-2765-KR/dp/B00DHW4HXY/ref=sr_1_1?ie=UTF8&qid=1376911818&sr=8-1&keywords=gtx+760
?
is there a little difference in fps and too big difference in prices?
I always play at 1920x1080. i7 870.

 

[Someone Somewhere]

I'd suggest getting a new PSU. If you're in the US:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Video Card: Sapphire Radeon HD 7950 3GB Video Card ($239.99 @ Amazon)
Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($55.99 @ NCIX US)
Total: $295.98
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-08-19 07:07 EDT-0400)

AMD just dropped the price of most of their GPUs - the 7950 is a little cheaper than most 760s, and ever so slightly faster (could go either way, really).