i agree with the two bikes idea. it is a good excuse to have two bikes. that's often handy, for when a guest visits, etc.

i keep one folder (a birdy) at home which i use in brooklyn - take into the library, restaurants, etc. i would never lock it up anywhere near nyc. and then i keep one folder (a ss dahon boardwalk i bought a week old for $100 off craigslist) at work in manhattan for errands and jaunts there. that works great. btw - i never lock the $100 folder either. i view locking folders as an insult to the dignity of a tool. like using a shovel to hammer nails - or tethering a whale to a pole.

in your case it would work even better - you commute in on the mini - than you go to the Theeeatur in the evening with the soho bike - take the A back to Inwood - bring the soho bike back for the 13 mile relatively smooth west side greenway back the next day. never 26 miles on the soho bike at most 13. friday night being the possible exception.

the carryme doesn't look that fun to me - why not a good quick bike for the long commute (birdy or swift?) and then a nice little bike for downtown.

for the downtown bike why not the brompton (you could often take that in with you to the theater). and if not, why not the a-bike? it looks like there's a new one coming out - the old one was maybe $300. that would go in any theater easy. a-bike and a-train, nice combo.

too bad this didn't get mass-produced.

good luck.