Suggestions/Help?

Looking for suggestions to upgrade speakers ($2000). System:

Amps: B&K St-140 mono blocks
preamp: adcom GfP-750
DAC: adcom GDA-700
turntable: music hall MMF-7
phono amp: musical fidelity
CD player: Marantz SA8260 player
SPeakers: Snell KII

I know it's hard to recommend speakers and everyone says to listen to them. The problem is that I'm in Vermont, and I have one Audio store withing 150 miles with dynaudio, B&K, and Paradigm. I've listend to the Dynaudio Focus 140, but are they wasted on my system? Should other pieces of my system be upgraded first? My Snells sound a bit 'tinny/screechy'. I listen to Jazz, classical and rock on cd/vinyl.