I get your point, but I find it funny that snowmobilers (who are probably 20# overweight on average) are so obsessed about sled weight.
And show me a $7,500 sled 200 plus horsepower RELIABLE sled that is lighter. You won't find one.
We are very lucky today to have some really light stock sleds on the market. Less than ten years ago people were spending $30k to buy a ~420lb CMX. The aftermarket was flooded with lightweight parts, because the sleds needed them.
The easy 100lb difference between the Nytro and the Pro is HUGE compared to me carrying an extra 20. The rediculous steering angle on the NYtro is another issue. I know the Yammi fans hate to admit it but the NYtro is a poor mtn sled at best. Sure it can be made reliable and powerful but that to me is a VERY small part of the equation.
The stock 800 Pro has enough power to take my 220lb butt to places it should never go and, I ride 10-13,000ft. I have been on and around turbo's, not my thing. There is also no way you will ever convince me that you can cover for the dead wieght with that turbo power. If you could, they would not all be for sale for pennies on the dollar. Those sleds have proven to be among the worst snowmobile buys EVER. They sure are cheap for buyers today but, ask yourself why the owners are all bailing for the new model, losing $10-20k to do so? Because the old one is really a terrible mountain sled.
To the OP... With an $8000 budget you should be looking at '13 Cat M800's, '13 Pro 800's and if Doo had the XM in '13, one of those. OR, get yourself a screaming deal on the Snowest Nytro, which is a GREAT option if it fits your riding style. I do not think tight trees and deep powder are going to be the best place to try and horse that machine around. Some that have owned them will claim otherwise, pick your poison.