How much should I pay

If thats the actual tank, why would you have a internal overflow in the corner if it was not drilled? It must be drilled in some fashion. Also 600 is probably the ballpark figure I would see selling for locally. Maybe another 100.00 if the liverock is really nice and he has a good amount
 
Around here it would list at about $1,500 on CraigsList -- And never sell. $800 to $1,000 would be fair, $600 would be a good buy for you if he needs to sell quick.

Jeff
 
That's an overflow box, you can see the end of the box about halfway down the back of the tank in the front shot of the tank. It more than likely has U-tube for siphoning the water to the external part of the overflow. I have one like that for my 55g (wish I would've gone drilled)
 
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