Preamp pairing with B&K ST-140


Hello all:
I'm ending my mid-fi ways and entering the hi-fi entry level realm. I was recently blessed with a B&K ST-140 and I'm using it with a Newcastle R-925's pre-amp out. Sounds good, but I'm told if I upgrade the preamp I'll give the Newcastle away. I split time between a pair of Paradigm Studio 40's and Klipsch Forte's. The ST-140 will hang for a lil' while but I foresee replacing it in about a year???
Any input appreciated,
tabascokid
B&K Pro 5 or Pro 10 and you are guaranteed good sound. Anything else and you are taking a chance.
Before considering a tube pre, consider the relatively low input impedance and soft lower end of the B&K ST 140.