Your 3 choices are all excellent. If you're not too concerned about upgrading to future surround modes, the Classe' SSP-25 is probably the best for the money. IMHO, its Dolby Digital & DTS performance is just as good as the others and its 2-ch stereo mode is phenomenal (best I've heard from a <$6K surround pre). The only major drawback is the fact that it may not be upgradeable to the new multichannel formats (DVD-A & multichannel SACD). For under $2K, it's the best I've heard.
If you can audition these preamps (preferably in you own home), I would strongly recommend comparing them side by side. Good Luck.
If you can audition these preamps (preferably in you own home), I would strongly recommend comparing them side by side. Good Luck.