I'm on my phone so I'll try to come back with a link but I've seen these outlet timers you could use? Basically plug it between your slow cooker and the wall outlet and it keeps power from hitting your cooker until whatever time you set. Originally made to turn lamps on at night but would work. That way you could get whatever slow cooker you liked, set it, then it wouldn't come on until you wanted it to.

Edit: something like this http://www.amazon.com/gp/aw/d/B006LYHED0/ref=mp_s_a_1_1?qid=1396462397&sr=8-1&pi=SX200_QL40