Hi Brian,
If you can swallow a click share agreement of up to 50%, ValueChecker offers a strong product.
For me, this service is only a small part of what my site offers, so a click share agreement (although expensive) makes more sense than paying for a lot of development.
If you decide to go ahead with them I'd be grateful if you used my sub - affiliate link:
http://affiliates.valuechecker.co.uk...b80847409761e5
Ben
Interested in quality, relevant link exchanges and deals, especially with UK sites.