1. I want to change from 24 speed to 18 (8X3 to 9X2). I assume this means I have to change cassette, chain and rear shifter. Anything else? (I'm just gonna remove the granny ring on the chainset for now and my RD is 9 speed compatible) 2. Can I use a road cassette on an MTB hub? Reason I ask is the ratios on the road ones are a little closer and I don't see a need for a 32T sprocket. 3. What make of chain is best? I want one that won't get rusty every time it gets wet! 4. Easy split links/Powerlinks, whatever they're called, good idea? Reliable? Bits I'm looking at are '08 XT shifters, XTR chain and SRAM PG950 11-26 road cassette. These should all work together yes?