Is this a good power supply. Also is it good for my build I have got a AMD 760k and a GTX 660.
How much does it cost? It looks very appropriate, but you might consider a cheaper option to allow you to allocate more to your GPU or your platform.
£45 don't know $ but I think around $50-$60
CM does make very good PSU's but right now you can get some PSU gold's for around $50 for 750w, but from my experience CM silent pro series is very nice for quite builds. I have a 1000w CM silent pro and like the name says it is silent.
CM Silent Pro and V###S line are pretty much the only decent lines
CM Silent Pros are expensive for the money, though. $50-60 is not too bad for a CM Silent Pro.
In my opinion the PSU is nice but you may want to go with something with a bit more watage just in case you want to upgrade in the future, you should be able to get some PSU gold-silver for about the same price with more watage (I usually don't recomend anything under 600w) so it is a good PSU but it is a bit overpriced for what it is.
I'm currently using a Tacens Valeo V 800W 80 Plus Silver Modular and I've had zero problems so far. (i've found that 80 silver works very well for me)