I've heard good things about the Valentine, but have no experience with them. I've used Bel detectors for many years, and been pleased with them. They are made by Escort, which also produces very good detectors.
I know you say price is no object, but it varies WIDELY. One of the first things I recommend you do is decide how much you're willing to spend... Good windshield-mounted detectors start around $200, but climb to over $500. Custom-installed versions start around $500 and quickly climb to over $1500, with varying installation costs on top of that.