Amd Sdk 2.5 with catalyst 11.12 works very good.
or jou could just run catalyst 11.11c, but you might get a 100% cpu bug. I've only gotten bug with 3 of my 7 systems though.
11.11 and prior either always have cpu bug, or maybe have CPU bug. I can verify that 11.12 and 12.1 never have CPU bug. They also work great for any 5xxx/6xxx card. They are also compatible with 2.1 SDK which is the fastest SDK you want to run with any 5xxx and 60xx-68xx card, but if you cant figure out how to install 2.1 sdk and use it, use 2.4 or 2.5 (3% slower than 2.1). 11.12 and higher have 2.6 SDK with them, which is really slow and bad, and -only- recommended (even required) if you're using a 7xxx card. You will have to find a way to install 2.4/2.5 on top of 2.6 in order to revert to the faster SDK.
As far as the miner to use, a large population will tell you to use cgminer, but I prefer phoenix because it gives me about 1-2% more mhash than cgminer (stupid variable intensities. even setting a high intensity is still variable, which is why its slower).