Hey
looks a good kit , iam fairly new to overclocking so dont take what i say as law
I would start by taking readings of idle and load temps as you are then check them with the components max temps . That will tell you if you have room to overclock. if your looking good from there then try AMD overdrive , if that doesn't work( didnt work for me) then look around at bios overclocking. Get to know what you are doing, youtube has loads of good vids. then slowly begin to inch your system up. The main thing is to overclock is very small sections so as not to damage your system, every time you overclock it bit more take new temp readings and run the stability test on AMD Overdrive that way you know things arent about to get all messy

If you want to overclock your GPU then i would use Catylist control center. IF that doesnt overclock enough for you then AMD again have a good tool
as before take it slow watch temps and run appropriate stability tests
as I said I am no expert so I would try get others opinions to
As I said I am not expert
Hope it helps
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Hard Disk :WDC (500 GB)
Physical Memory :4096 MB (2 x 2048 DDR2-SDRAM )
Video Card :Sapphire Radeon HD 5570 Series(GPU: 700MHz GM:850MHz)
overclocked
Processor: AMD Phenom 9550 (2.31Ghz) overclocking