2 things.
1) Although it's not absolutely necessary, I prefer matching the drivers on the speakers, especially the front. The BP10Bs have 6.5" woofers, while the CLR2002 has 5.25" woofers.
2) Unless your friend's room is exactly like yours, there is no telling how it will sound in your room. If he is willing to let you try them out first in your room to see how they sound, then it may be a good deal.
BTW, how do the Klipsch have better "paper specs" than the Definitive speakers?
The F3 is 35Hz - 23kHz +/-3dB, while the BP10B is 30Hz - 20 kHz +/-3dB, and Stereo Review measured the BP10B to be 25Hz-20kHz +/-3dB.
However, with that being said, it is how they ACTUALLY SOUND in your OWN ROOM that matters, not the specs or price.