I have a Seven bike with DA triple setup. Thinking of making a light-weight climbing monster out of it by putting on an XTR 11-32t cassette, XTR rear derailleur, and mtn handlebars. I will keep the DA triple cranks, front derailleur, and brakes. I will need light-weight mtn shifters and brake levers that will work with Shimano DA front and XTR-rear derailleurs, and the DA brakes. I heard that SRAM used to work, but that their new offerings are no longer compatible with Shimano. Suggestions??