First time overclocking--- looking for some safe values

hi guys, a moderate OC that can be maintained for long hour usage is what would work for me(i leave my computer on for days a time, generally for some kind of download or whatever). Additionally i was wondering if there were any BIOS settings i should aware of and change, like the ram setting. and thirdly, if someone could give a general ballpark for a comfortable temperature for the different elements that should be concerned about id be grateful. I was just doing simple things on the computer, installing os's and such and the cpu (from my rough memory, was clocking at 36c which seems kinda high for what i was doing, and around 20's (maybe) for the rest. Ill come back tomorrow with more accurate numbers if anyone takes an interest. thanks!

MB ASUS P6T DELUXE V2 1366 X58 RTL

VGA XFX|GX285XZWBF GTX285 1G RT - Retail

THERMAL COMPOUND NOCTUA NT-H1 RT

CASE CoolMaster|HAF-932-KKN1-GP BK RT

PSU CORSAIR|CMPSU-750TX 750W RT - Retail

CPU INTEL|CORE I7 920 2.66G 45N R

MEM 2Gx3|OCZ OCZ3P1600LV6GK R

HD 1T|WD 7K 32M SATA2 WD1001FALS % - OEM

CPU COOL NOCTUA|NH-U12P SE1366 R

great! sorry i didnt look for guides, i figured that if there were a guide it might set the values too high and result in damaging my computer due to the long usage. so is the noctua i got fine? or is it a loser? haha i hope not that thing was annoying to mount, its fans have an odd clip on function.

so that seems to cover the cpu, so is there anything i should set for the north/southside bus, GPU or ram? and anything else i dont know about? thanks a bunch!