Q6600 Temps - is it OK?

firstly i must say that i am not an expert in this hardware overclocking field... though finally decided to overclock my quad to a decent level with a after market cooler (Sunbeamtech CCF)... but not fully sure about the temps on load... so need your suggestions on this... also plz comment on how far i can go with this setup or i need anything else to do....

before using the after market cooler i tried with intel stock hsf... i am putting both the results for a comparison

Abit IP35 Pro (BIOS-14) + Intel Q6600 G0 (VID-1.2875v) + 2x1GB OCZ DDR2 800 + TAGAN 600W

All BIOS settings are @ default except the following ones

Temps are collected from Real Temp 2.70 and ABit uGuru Panel

Default with Intel HSF

External Clock = 2448MHz (272MHz x 9)

Idle CPU Temp (avg of all four core) : 43C
Idle PWM Temp : 38C
Max Load CPU Temp (after min 1hr Everest CPU Stress Test) : 56C
Load PWM Temp : 48C

1st try with Intel HSF

vDIMM = 2.0v
FSB = 334MHz
FSB/DRAM = 5:6

Extrenal Clock = 3006Mhz (stable)

Idle CPU Temp (avg of all four core) : 45C
Idle PWM Temp : 38C
Max Load CPU Temp (after min 1hr Everest CPU Stress Test) : 64C
Load PWM Temp : 48C

1st try with Sunbemtech Core Contact Freezer

vDIMM = 2.0v
FSB = 334MHz
FSB/DRAM = 5:6

External Clock = 3006Mhz (stable)

Idle CPU Temp (avg of all four core) : 36C
Idle PWM Temp : 37C
Max Load CPU Temp (after min 1hr Everest CPU Stress Test) : 51C
Load PWM Temp : 46C

2nd try with Sunbemtech Core Contact Freezer - My current settings

vCore = 1.2975v
vDIMM = 2.0v
FSB = 358MHz
FSB/DRAM = 5:6

External Clock = 3222Mhz (stable)

Idle CPU Temp (avg of all four core) : 37C
Idle PWM Temp : 37C
Max Load CPU Temp (after min 1hr Everest CPU Stress Test) : 53C
Load PWM Temp : 46C

my english is bad.. plz co-operate

thanks in advance