I'm looking for suggestions/advice on components for my Miyata 610. It has 68mm bottom bracket and 126mm rear spacing. Can I put 7 speed or more in rear would like to put triple up front. Would also like to switch to 700 wheels and wonder what brakes would be good. It currently has Diacompe 981 canti brakes which I like. I put a 700 wheel on and the brakes almost matched perfectly - barely a difference. I prefer using SunTour components after reading up on them in the forums and am most interested in value and reliability. Need cranks/chainrings too. New or vintage is OK. I would really appreciate any help here. The bikes original components were all switched out for low end stuff -double front and 5 speed in rear. Thank you.