E5200, P5QL Pro, and RAM OC Help Needed!

Well I've tried, and tried to overclock my computer and I've never successfully managed to get optimal settings while keeping things stable.
I'm sorta scared to overclock anything hard unless I have others to confirm that my settings aren't pushing it too far to cause damage. (can't afford to replace a computer)
Can anybody give me a ballpark area or any information at all on how well I can OC this motherboard, CPU, RAM or the whole setup in general? Thanks in advance

I've managed to successfully get it to a stable 3.4GHZ, but I had a horrible CPU/RAM cycle ratio. I also need some help on RAM overclocking, because "ALL" my RAM overclock attempts have resulted in post failures.

Hardware info:
E5200 (Arctic Freezer Pro 7)
G.SKILL PI Black 4GB (2 x 2GB)
Asus P5QL Pro


CPU: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Motherboard: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
RAM: http://www.newegg.com/Product/Product.aspx?Item=N82E168...