If you look at the "check your serial number" thread, Arc10 is the most popular of the last 3 years or so. I see 2 years of the thread are already missing/archived, that would probably boost AT700 to #1 of the last 5 years and maybe an extra boost for TI-10 ...
lot of recent racquets can be ranked as all-time classics :AT 900, AT 700, MP 99, ARC 10, NS 9000 and NS 9900, etc