Well right now looking at it, at first glance, I'd say go for it all the way. The MS360 (formerly the 036) is a great saw, and is the predacessor to the 361 we all love. An ebay seller with 100% pos feedback, and a guarantee/return policy. Sounds good to me. Thinking about it more, the price on it now, $206 probably isn't what it will sell for, but you could pay all the way up to your $370 limit for this saw, and have a "better" saw than the 310. By better I mean that this is a pro saw model. It's still a Stihl, so it's like comparing a Chevy Z71 fullsize pickup to an S-10. They're both Chevy, and of the same quality, maybe made in the same plant, but the fullsize is more of a pro truck that you might see a contractor or farmer driving. Does that make sense? It's the closest analogy I could think of at 5 AM! Another thing to think about, and if you can email him in the time left, I would- If this is a 2003 saw, why has he changed the piston/cylinder, clutch, bearing and starter cord? It could be as simple as he ran straight gas through it, which is common, and had to fix it. That'd be a decent deal, as it's a low hour saw which has some brand new significant components. Now, if he drove over it with a skidder and had to replace these things, you may have some other problems with it, though I doubt that's the case. I'd say it's a question of straight gas, or he's just a tinkerer. Or it could be he's a pro and the saw has tons of hours on it and he just rebuilt it, though it doesn't look like it's seen pro use. But he's got that guarantee, he says it runs great, it looks great. Worse come to worse, the 360 is a recent model, and parts, service and help are readily available at the dealer, or here. If I was looking for a 360, I'd buy this saw. I haven't been watching 360's on ebay, so I don't know what they're going for, but I'd pay about $300 +/- for this saw. Pay whatever you're comfortable with, but you start paying up into $350-$400, you can get into 044/MS440s for that. But that's just MY opinion. I'm sure you've read the other threads on here about buying a saw on ebay. I've had decent luck so far, with only one saw being not what was advertised, but I was able to sell it for parts, and get my money out of it, so all's well.
Good luck, I'm going to bed. I'll check in with y'all in the morning.
Take care all,
Jeff