When I bought my Bel RX65 they were offering a deal if you bought factory-direct and sent them an old detector there was an $80 rebate (regardless of age, brand, or condition - I sent 'em a broken Uniden that had been in a junk drawer in the shop for two years).
So after buying the 3 yr extended warranty (which includes free software upgrades if they become available) and paid to ship back my old detector I spend a few cents shy of $300. It's expensive for a radar detector but for one as good as the Esc. 8500 X50 or the Bel RX65 factory-warrantied for 3 years it's worth every penny, IMO.
So if you're willing to spend that three hundred bucks (and can participate in the rebate program to make it that price) Bel's still got the rebate going on, though I can't say for how long.