I would like to keep the crankset if I can, but I'm not sure what will be compatible with it. Thanks for any suggestions.

http://i.imgur.com/qUfX9GJ.jpg
http://i.imgur.com/Ur7KNAR.jpg
http://i.imgur.com/B1w1PiO.jpg
http://i.imgur.com/U0E0RdN.jpg
http://i.imgur.com/ZCTTLKG.jpg
http://i.imgur.com/pGdhLpx.jpg