Which seasonic PSU between 500-600W would you recommend?



XFX exclusively use Super Flower, but they're just as good as SeaSonic.
 


If not better, I did know they didn't make their own, so just went 50/50 and said seasonic :/
 
Sorry guys.

Here are the rest of my specs:

CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor (£166.97 @ Ebuyer)
Motherboard: ASRock Z97 EXTREME4 ATX LGA1150 Motherboard (£100.52 @ Ebuyer)
Memory: Corsair Vengeance Pro 8GB (2 x 4GB) DDR3-1866 Memory (£68.16 @ Scan.co.uk)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£38.98 @ CCL Computers)
Case: NZXT Phantom 410 (White) ATX Mid Tower Case (£65.99 @ Novatech)

I haven't decided my GPU yet, I'm afraid. IT will probably be a GTX 770 or a R9 280x

http://www.newegg.com/global/uk/Product/Product.aspx?Item=N82E16817151040 - This one is unavailable in the UK.

I may go for XFX, but I have heard that seasonic are the very best.