Hey hollywood1, I had a '98 700 RMK and it was an awesome sled. I took that thing through hell and back more than once and it just kept on going. I sold it and bought an '02 800 RMK 144 thinking with a longer track and some extra ponies under the hood I'd have an even better sled... I was wrong!! Don't get me wrong, it was a good sled, it ran pretty good and was pretty reliable, but I think my old 700 would have had it's lunch anyday of the week. Then I switched teams and bought an '05 M7 141". From day one, I knew it was going to be far better than either of my RMK's. It has more power than both of them, feels lighter, handles better, and best of all, if I'm just putting down a trail and hit a rock or tree stump, my day isn't over because I've bent a trailing arm...AGAIN!! I rode it stock other than an aftermarket can for the first season and had no problems at all. Just put gas in it and went, and loved every minute of it. In my opinion... huge advancement in a sled, yes I did switch teams, so I'm kind of comparing an apple to an orange, but still an advancement. I would bet that most new sleds out there don't have all the problems that you've listed, whatever the brand. Yes, there are some that do, but I seriously doubt it is the majority. Sh$t happens sometimes. Once in awhile the new sled isn't quite as good as last years (and even that's just opinion), but if you are implying that your old '98 is as good or better than anything new out there, you need to get out of the ice age and into the world of today. Nothing is made perfect, there are always some flaws, but I guarantee you that sleds are getting better and not worse.
Frosty, my .02... If you're willing to spend the money on "extras" for your sled but don't want to lose reliability, find the brand/chassis that you like the best, and spend the rest on taking weight off non-critical things like someone else said. Buy a lightweight hood, a lightweight seat, a lightweight can, a lightweight suspension, and even if the motor doesn't have the highest HP, you'll still outclimb and out manuever those that do because yours is lighter. There are 2 ways to improve power to weight ratio... Increase power, or lose weight. Losing weight won't comprimise reliability if done with some smarts, and it will get you farther up the hill (if that's your thing) just as much as adding HP can.