First, my fighters, I have a friend willing to part with a 15th Anniversary Street Fighter Arcade Stick by Capcom

Will this work with my 2D and 3D fighter collections OK?
Second, as for importing, I am wanting to pick up DDR 2nd and Club Mix. I already have a Cobalt Flux Dance Pad

Will this work with the Dreamcast DDR games?
Third, while I'm a fan of Bemani, I have yet to try Pop 'N Music. I see there was a few releases for Dreamcast in Japan, The controller however can be hard to come by. So will a generic Playstation like this one get me by until I find a official Konami Dreamcast one?
http://cgi.ebay.com/Popn-Music-Mini-Con ... dZViewItem
Lastly, Which is the best PS2 Controller to Dreamcast adapter out there?
Thanks
Guinness.