I went with a six core 6350 in the end, only because it was going for what I thought was a very good price, I can always upgrade this later.
The build went a lot easier than expected, I`ll still had a couple of items to get, an SSD and a hard drive but ended up pinching the HDD from an external drive.
A couple of strange things I noticed, not that there problems at all.
1) During the build I used an old PS2 keyboard, when I switched the PC off I found it was still getting power.
2) I tested the video converting speed using freemaker video, on the new PC it took 22 seconds for a 90sec file, on my old PC it took 3 minutes 59 seconds (some software and settings, same 90 sec file)
3) during the video conversion the CPU jumped up to as high as 11.3 GHZ from 3.9 GHZ and settled back down to 3.9 once the video had been rendared, I have no idea if this is normal or not.