Show us your mixte!

[mtbdarby]

I just have a few questions since I'm starting my first rebuild on my sanwa.

Has anyone changed a mixte from a double to a triple? I'm working on my sanwa that's a double with 10 speeds. I plan to use it to ride with my son using a tagalong for one last year so I'd really like the smaller gears. (then it will be my commuter). I believe the biggest ring is a 53 on it if that matters. Two bike stores are recommending I use a hybrid or mtb crank on it if I do that to control costs.

I also need new tires but they said the wheels are good (although dusted with rust). The only problem is I'd like a quick release wheel on the front for obvious ease of remove since I would transport in my car (no carrier yet). Any thoughts on that since I'd like to switch it to a double? Not that I have to have matching wheels but it would be nice.

Or I could just buy this one and be done with it:http://wausau.craigslist.org/bik/2285719030.html
They've been trying to sell this for a while so I would hope I could talk them down a bit.

Thanks for the help!