Wow. Very jealous, not sure I should help
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Shocks: I only did 25k on the stock shock before deciding it was fit for the bin, so yours must be very tired! Mine's a 2008 bike, but I'm pretty sure they've all got the same Sachs shock with a piggyback reservoir. I thought the damping was still OK at that point, it was just the spring that was rubbish. There's a few on here with the Hyperpro spring on a stock shock - but no-one I know of with 50k up on it. Similarly I can't think of anyone who has put more than about 15k on an aftermarket shock.
Linkages: I'll try and measure later if noone else has by then. I've got stock ones on the bike, and a set of Off-The-Road +35mm ones ready to go on. Can't comment on the ride as I've not fitted them yet.
I've got Renthal 613 bars on mine, which give you about 25-30mm rise over stock without changing risers. You'll lose the standard handguards/bar weights unless you feel like tapping the ends with whatever thread it is. I just fitted Barkbusters, the vibration doesn't bother me.