BFG 6600GT-OC overclocking

[Beast]

I have the TT Bigwater cooling both my CPU and GPU, which this is one of the easiest w/c kits to install and brings my scorching P4 LGA 775 temps down almost 20c idle from the stock cooling. I now have my BFG 6600GT-OC running at 593/1190 with the idle temps being reported by coolbits @ 47c. I dont think that my load temp goes over 58c during gaming. Is it worth it to overclock more or just stay where I am? I have run 3dmark05 with no artifacts whatsoever. is there any way that i can see the load temp while 3dmark05 is running? I am going to wait until Dec-Jan to build me another system. I think that my 6600GT can last for gaming until then. any opinions appreciated.