FWIW
M8 Rider, at your height and weight I would go with a 162 - the difference in handling isn't that big of a deal, and you're big enough to throw the sled around. As far as M8000 or 9000? It's a personal choice, it really is. I came off of a modded M1000 running 200hp, my backup M8 pushing 165hp - both 162 x 2.5" CE's, both at least 50lbs lighter then stock. I now ride a 2013 M1100T, and we have a 2013 Pro in the household, too. I enjoy the new PC chassis, and couldn't resist to throw some EVO goodies at it - most fun I've had with my clothes on. That said, I've jumped between the PRO and the M1100T several times in the course of a ride - to me the handling is very comparable, minus the additional weight. I am a big guy (6'2", 240 in riding gear) and in good physical condition, so throwing the 1100 around isn't a big deal for me, even in my 40's (ish) lol. If you pick your way through the trees all day - the 8 is for you, can always big bore it. If you have a lot of mixed riding (climbing, boondocking, dropping into places you shouldn't be with one way out), the turbo is your ride.
P.S. I'm still on the factory belt at 600 miles, but did replace the chain as it was stretched to hell. Instead of putting factory chain in, I deleted reverse & installed a C3 belt drive. Venting is a must, and a Team Tied was a bonus (although Cat should have the secondary sorted out for 2014

If you buy either sled, get an alignment bat and check offset and alignment yourself, mine was out to lunch the day I picked it up.