So, I have been getting deeper and deeper into the world of film in the last 6 months. Starting with just casually shooting my film M as a companion to my M9 to now leaving the M9 at home most of the time and shooting film almost exclusively, developing it myself, and I've even set up a darkroom... Literally all in less than 6 months. Apparently, I'm sick. Anyway, for some reason I can't explain or rationalize I now want to play around with an MF camera - more specifically something in the square 6x6 format. I've got a budget of around $500. What would you guys suggest? Is there anything out there that I won't grow out of quickly and that can give me something (maybe not necessarily better) over my every day setup of an M7 with a 35mm ASPH Lux? I shoot Kodak Tri-x and Tmax 400 almost exclusively. I've never even so much as held a MF camera. Ideas? Thoughts?