You could write a script that Googles each (without tld) and then store the number of results for each. That gives you at least a metric of quantity. Or a script that matches each against the online database of companies, like the Companies House in the UK. You can make it 'clever' by replacing 4's with A's etc.
If they're .coms, then they're all valuable. They can sell for thousands. The ones with the weaker letters like q, x, z, etc will naturally be less valuable.