Found this page awhile ago and love it. v.22 is my favorite, as it's when I learned what a modem was, though I'm also fond of v.32 and v.34... I stopped using dialup before upgrading to v.90 (combination of using a 33.6 modem a bit longer than usual and then being a reasonably early adopter of a cable modem).

See a couple comments of people using one as a ringtone... that is an excellent idea and I may do that now.