Mine is 31 ^_^
Took a few pics of it with my cam phone.

I had upgraded both Thundergun and Raygun, no tactical grenade, had Juggernog for all 31 rounds, Revive from round 1 till round 27, Speed Cola and Stamin-Up from about round 15 till 31, and PHD for the last 3-4 rounds.

Btw, this happened today, and this was the first time I tried to play Ascension seriously and without fooling around. Didn't give me a good first impression, but it turned out to be a pretty good map.