Have a few questions about bi-amping..

I have a question. But, it takes some explaining...
Ok, I will be upgrading my speakers early next year. A friend is selling me his pristine Devore Fidelity Orangutan O/96 loudspeakers when he gets their new version of these as soon as they are released.
I currently use a Supratek Chenin line stage tube preamp with a solid state Cary Audio SA-200.2 power amp. These drive two KEF R700 loudspeakers. Now, I know the Devore Orangutans are far more sensitive than the KEF's (97 dB vs 89 dB). So, knowing this monster power amp will be even more unnecessary than it currently is (I didn't get this because of the power, I got it because I have always loved it's performance/musicality), I have recently purchased a pair of Cary 300 SE tube monoblock power amplifiers. I'm very excited about pairing these low wattage SET type amps with the Orangutans. The 10 watts per channel will be plenty to drive those sensitive speakers.
However, I would love to be able to start using them as soon as they arrive (this Thursday). But, obviously worry that they won't be able to drive the less sensitive KEF's for the next six months.
So, I know I will have to wait and see how they sound, but, has anyone had any experience with bi-amping these speakers? I am thinking of bi-amping with the Cary SA 200.2 for the lows and the tube monoblocks for the mids/highs. Will I need an external crossover to balance the difference in gain between the two amps? Or will the passive crossover within the speakers work fine? Anyone?
Thanks.