domain Please Help!

[Plutonic]

Okay, I need to know how much I could get on average of names like:

LLL.org = $???
LLL.com = $???
LLL.biz = $???
LLL.us = $???
LLL.net = $???

I am thinking of buying a 3 letter domain but need to know the best extension.

 

[Alan Glennon]

A commonly-used site for LLL values is: 3character dot com.