Buying new PSU (CX600 v2)

Hello. Recently my old PSU died (which was 450W) and now I am searching for a new one. I am not an expert and that is the reason I am asking - is the Corsair CX600 v2 good enough. I've read some reviews with either positive or negative opinions. Here are my specs:

MB: Asus M3N78 PRO
CPU: AMD Phenom X4 9650 (2,3GHz)
GPU: nVidia GF 9600GT (512MB, GDDR3, 256bits)
RAM: 2x2GB Kingmax DDR2 1066MHz and 1x2GB Kingston HyperX DDR2 1066MHz (total 6GB, running on 800MHz)
HDD: Hitachi Deskstar 500GB 7200rpm
Others: 5 external fans (excl. the CPU, GPU and PSU one), 1 cathode light, DVD-RW drive

The system is around 3 years old (excl. the Kingston memory module which is around 4 months old). Also I have to add that I am planning to buy a new GPU soon probably from GeForce 500 series (GTX560). So is this PSU approptiate for my system?

P.s. A simple question. I saw the cable configuration of the CX600W v2 and I noticed that it has only a 4+4pin 12V cable. Currently my mobo is plugged with the ATX (20+4pin) connector and 4pin 12V one. Can I use only one of the 4+4pin of the CX600W on my mobo? Can this be a problem? Thanks in advance!