2.7 not a "true sports car"?
I don't think you know your Porsche history!
Perhaps the most coveted Porsche is a 2.7, the 1973 Carrera RS
http://www.theautobahn.com/forum/showcar.php?do=overview&car_model_id=166
The June 2007 Excellence Magazine recently did a 2.7 Porsche revisited article
where they put the 2.7 Cayman head to head against the RS.
Believe it or not the RS which
won at LeMans had less power than any of the modern 2.7 engines from the Cayman and Boxster. Victory has more to do with weight than power.
As for the waterless washing its definitely the way to go, even if you do have access to a hose. Doing a full on bucket and hose wash every week is bad for the paint. Try the optimum No Rinse from
autogeek.net. You'll still need to take it to one of those coin operated car wash places to water rinse the soft top with an oxo feather tip brush, which I think you can get at autogeek or detailcity.com as well. weekly rinsing will keep the top looking new. A properly cared for canvas top can last 20 years. Don't forget to get the Raggtopp kit.