whats the better overclock setting here...?

My system:

AMD A64 4400+ x2 (Toledo core 2x1mb L2 cache)
MSI K8N SLI Diamond (NF2 Chipset)
POC Nvidia GF7800GTX 512mb Extreme
2 x 512mb G.Skill DDR Ram PC4400 (DDR550)
Enermax PSU 600w
Watercooled CPU

I can achieve a stable overclock of the 4400 with a marginal voltage
increase at these settings:

11 x 240 = 2.64ghz HTT x4

and

10 x 260 = 2.6ghz HTT x 4

Mem settings @ 2.5-4-4-8 (1T) 2.8v

what are safe temperature ranges for this cpu...?

thanks all....