There aren't any good corsair 750W Corsair units for that price, i'd recommend the XFX 750, its a good unit. If you need longer cables you can always pick up cable extensions.
https://www.komplett.no/xfx-proseries-xxx-edition-750w-psu/760108
You said no good PSU's in that price range but isnt the RM 750 good? What is bad about it??
They had the CX series and the RM series within the price range, but the CX units are intentionally cheaper units, and the RM unit is more expensive when the XFX XXX series was damn good, even the Pro Series(non modular) they have is better built and on par or slightly better than the RM for notably less. http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story2&reid=216