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Help me pick out a radar detector for bf?

My boyfriend bday is coming up and he wants a radar detector for his truckk… I’m clueless when it comes to these things, but I know he wants voice alert… I found the Whistler XTR-330 at the radarbusters site and the Cobra XRS 757 at walmarts site.. Which is better? Or is there a better one that is less than $120 that I didnt find? I’m in college and the cheaper the better, but I dont wanna get him a hunk of junk either :] Thanks for your help!

Valentine 1 is in my opinion the best in the market we traveled form Los Angeles to Sturgis ND and iw orked like a charm our average speed was 110 mph.
http://www.valentine1.com/

Radar Detector Review – Whistler Pro 78 and XTR690