I can see how this would be very difficult. I ultimately do not ride all my bikes as much as I should. The effort which I expended in aquiring them and building them is usually significant. I wanted a super record bike first and foremost and spent way to much money gathering the parts and the frame I bought was sub-par but served well as my first place to hang the parts. The I got a gazelle to replace that italian frame and it rides so well I have no choice but to hang onto it. I spend a lot of time and money and time pining for that super record bike and now that I have it, though I ride it infrequently, it will not go. Somthing I never though I would say but my Marinoni Special is the bike that is in Jeopardy because I have a smaller, newer steel, lighter road bike in my Bilato built Marin and I can't deny that it's vasyly improved ride sue to oversized tubing and S bend stays etc... makes it my go to bike for road riding. Now the marinoni is redundant! It's big, heavy and feels sluggish by comparison. It's such a tough decision to make. I think you should narrow it down to two. Ride them both back to back and then decide.
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1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear