I have never heard of Martini but this boat seems to be very nice at a reasonable price. I ran across it on St. Louis Craigslist in case anyone is looking...
http://stlouis.craigslist.org/boa/1510360213.html

Nicest Martini I've seen in awhile. Decent buy, too. Narrow beam boat. TTT

They're nice boats as long as you don't mind the cabin, or lack thereof (there's no headroom in them). A guy a couple of racks down from me has one (I think his is a 24 though, his cabin looks much smaller than the boat posted) and he keeps the thing spotless. The boat is sweet. I'd love to go for a ride in one. It sits low to the water and flies.

In the 80's, I used to race against one all the time on the CT river. I was in an 18' Sutphen Gran Sport with an AQ311 Volvo package..and we were both running low to mid 60 mph...