"Holy Trinity" of Lenses - advice needed

12, 25, 45, is a classic trio.  If you are fine shooting with primes, I don't see why this would be a problem.  You may want to keep the 12-50 around for dusty or wet conditions, but if that's not a regular thing, then just sell it.

--
SLOtographer
"If we limit our vision to the real world, we will forever be fighting on the minus side of things, working only too make our photographs equal to what we see out there, but no better." -- Galen Rowell