The BP-26 is an excellent audiophile grade, no non-sense, bullet proof, elctro-mechanical preamp designed for hard core two channel audio applications. If all the features that are superfluous to that concept are more important to you than what the BP-26 represents then by all means a swap out to the BP-17 might be for you.
I personally love my BP-26 and would only trade it for something superior to it like the ARC REF 5 which at more than double the price of a BP-26 it should be far superior. The only shortcoming of the BP-26 for me manifested when I became interested in the BHA-1 and found it shy one balanced output. I talked to James about it and he said use the tape output for that application and you won't be missing anything.