To answer the OP's big question, I have something newer - I think it's a CycleOps magnetic trainer - and it works just fine on narrow rear ends. I think I could put a track bike in there, with how narrow it goes.

I've done wind, mag, fluid, and rollers. I prefer the rollers - I have the Kreitler metal ones - with the caveat that resistance is not very high, and the available "killer headwind" attachable fan resistance unit is noisy! You can make quieter resistance by getting really awful cheap tires and running them at low pressures. Don't use your nice tires, they'll wear out! The key thing for me was to get some of those chainsaw earmuffs and put in earbuds under them so you can hear your favorite podcast over the din.

Or ride through the winter, but beware New England road salt will corrode your nice stuff, no matter how well-fendered your bike is!