Active Crossover Recommendations

I want to experiment with using an Active Crossover to seperate high frequencies (going to my Quad 988's through Cary EL34 triode amps) from low frequencies (going to self powered subs by TBI or an ACI Titan). Can anyone recommend a good active crossover with a steep slope for this application. I would like the Xover frequency to be somewhere between 80-120 hz, best case around 100 hz.

Thanks very much for your suggestions.