Looking into a phazer.

Im in the market for a new sled and I am undecided as to what I want. I'm pretty much decided on a 4 stroke and Im really considering the phazer mountain lite. Keep in mind I am living in New Brunswick Canada and our winters are hit and miss and usually involve rain after snowfalls. So I dont have a need for a huge 162 track or anything of that nature. Also I am riding a 1996 formula s 380 with a 136x1.75 track with 8000km's on it. This sled had gotten me around but of course it lacks in the motor. So with all that I think jumping to a 500 liquid with a 144 would be a nice step up. The biggest problem I am having is I can't find a used phazer mountain lite within a days drive. There is a few short track and so far 1 mountain lite. The mountain lite has 9000km's on it which im worried about.

So I was thinking of picking up a short track phazer (most have 2500ish km's on them) and putting on a long track. Anyone out there make rail extensions for these? can I go 121 to 144? Any advice on the one with 9000km's on it? The reason I'm worried is my current sled has 8000km's and its starting to give some problems and I find myself out alone quite often and im looking for something a little more reliable.

Pretty much just looking for any advice on purchasing a phazer. Also they all go for around 6000cdn. be it a short track with low miles or the long track with high miles.

any advice at all on the phazers?

Keep in mind elevation around here is a few hundred feet. Mostly flatland. We don't get 3 foot snowfalls. The 380 does its job just looking for the next step up. From the sounds of it the phazer would do what im looking for. If I was riding up in the mountains I think it would be a different story.