Hi Andrew,
First and foremost, check out this site (learn it, live it and love it

):
http://www.190slgroup.com/
I personally think a 190SL is a fine choice for a classic roadster, especially since almost all of the parts are still available. I seriously considered a 190SL but ended up with a 1968 250SL, as it was more affordable for me.
Also check out:
www.oursl.com