I think if you really had to narrow it down, a stereotypical hiphop track is 93bpm...lol, I have actually heards so many tracks at just over 90bpm, but its not really fair to say a genre has a certain range of tempos, expecially in hiphop where a lot of the time it depends on the sample.
I like to vary the tempos I'm working with quite a lot, but I reckon for the most part I'll work at around 70-80bpm which is pretty slow...but really syncopated drum patterns can sound really nice and 'floaty' whereas at higher bpms a more syncopated drum pattern cound sound a little too hectic for anything other than a break, and a lot of the time I aim for atmospheric or subtle/mellow sounding stuff so it wouldn't really work for me.
Alot of old school hiphop is faster than most stuff now, possibly because more artists had breakers and body poppers in mind....I'm not sure to be honest