Doug
I suppose it does become relative to the investment and long-term goals as to traveling for research. My 1000 mile round trip cost me no more than $250 (fuel, food, and an overnight stay). What I learn from the trips I have taken for two long-term speakers was a wealth of knowledge and an ultimate listening experience which have been priceless.
If you attend RMAF in Denver and extend your stay or arrive early you will find a town full of two channel quality dealers.....possibly one of the best selections in the country. Colorado Springs, Boulder, Ft. Collins and surrounding areas all contribute with some options. You don't have to buy there but the goal being to listen and seek information.
My goal was to buy my last speaker and finish the ride. Now I find the shows much less interesting confirming my ride has finished.
gwalt