I just go to the classes menu, then filter on the time limit I want (usually 20 or 30 minutes) and then I filter on the music type (always rock or alternative for me).
I've only been doing women instructors, and a few of them get way too inspirational and it gets annoying to me (Jess King is like this, but she has amazing fake boobs that bounce as she rides). My favorites have been Kendall Toole because she's not annoyingly inspirational, and Leanne Hainsby as she's also not annoyingly inspirational but her British accent does annoy me!
Having a bunch of friends and people from work follow me on there has kept me going with it. Its hilarious when my boss calls me in the morning and says "hey, saw you did a ride with Jess King last night....how amazing were her tits in that one?" It also bothers me when my wife will output more than me in a day, and then it motivates me to go further the next day just so I can win.
I'll add you on there.....my username is RyanH1983