The Overclockers link points to a couple of different products so not sure which one you're looking at exactly. If you can give the model name or whatever I'll have a look
The Phenom II 965 you pointed to on EBuyer is an excellent CPU for gaming. Coupled with a good GPU and RAM you shouldn't have trouble playing any current games and it will also last you quite a while since games are only now really starting to fully utilise multi-core CPUs. It's also a good overclocker since it has an unlocked multiplier. The one thing I will say about it is that you may wish to go for the 955 instead which is clocked at 200MHz (off the top of my head) lower, but with a very small overclock you can achieve this 200Mhz effectively giving you a 965. May just save you a little bit of cash and you can of course overclock further again if you wish. Hope this helps!