I recently upgraded to an i7 processor (which is brilliant, I might add!) and a new motherboard. I took it into a shop to get it fitted, and low and behold I needed a new PSU. So I asked the man at the shop to put one in (an EVO labs model, so I expected it to work!) - this then blew. He replaced it (for free, to be fair...). This PSU didn't blow, but kept cutting out and rebooting my PC during graphics heavy games, and was as noisy as a jet engine!
So I bit the bullet and bought this Corsair TX750 v2 from Amazon. At £80, it isn't a 'value' option, but I promise it's worth the money, and you could pay a lot more for something not much better! The description doesn't make it clear, but this IS NOT a modular PSU. There are A LOT of connections, and all the wires have thick cable coverings. It's obviously built to be durable, but it was a squeeze finding a place for all the spare wires I wasn't using (who needs like 8 sata connections anyway!?). If you have a small case, a modular PSU might be better for you, however cable ties are supplied and if you're good at tetris there shouldn't be a problem.
This PSU also comes with EPS 12v (that's CPU power, which most modern motherboards require) 4-pin AND 8-pin. The latest intel and AMD chips NEED an 8-pin if you're using power hungry programs, so this is an upside.
This thing is also REALLY quiet! I have decent CPU and case fans, so with this my PC is next to silent. It does pick up a bit when it's under load (in a video game, for example), but, to put it in context, it never gets louder than my PS3 (and that thing is really quiet!). In fact, I've sometimes walked up to the PC and tried to turn it on, not realising it already is!
A brilliant buy! I've learnt you shouldn't skimp on a PSU. Unless you have a military grade PC, if you want a well priced PSU upgrade I wouldn't look further than this product.