Go for it. About 75% of da time i DJ i play old skool tech, rave and hardcore. What i have found is starting the set with 3 or 4 New 100% floor fillers, then whacking in a couple of oldies. I have found that if you keep the new skool even or more than classics, you will keep most of the dance floor. Some of the classics go off when pitched up. I find that alot of the crowd luv pitched up classics. My self i keep it around 137/139 bpm.
Do want u want, but i have found this is a good method ;)