A few comments--more odds and ends than anything--
On paper the stihl ms 460 has the most vibrations. Having run all the saws you mention (and having owned a 372, 460 and a dolmar 7900) it also has the most vibrations in real life. It has rubber mounts while the others have the newer type spring mounts.
Of the remaining saws, the 441 is probably the smoothest. The 7900 and 372 are both very smooth. Anything with modern springs is smooth. In my experience the 576 is the smoothest saw I have run. But really, no spring AV saw is ever going to strike you as being a "rough" saw.
I think the choice really depends on your application. If you want a sweet ass saw to work a log pile, the 7900 is where it's at. If you're after felling and a real in the woods all day type worksaw, you might look at the other options.
The dolmar doesn't seem as robust to me. The most robust 70cc saws, in terms of get thrown around and take abuse type of robustness are the stihl 440 and 460. You can't deny that there is more metal on them in more places. Maybe I'm making a false assumption in that metal is more durable than plastic in some cases, but there is more metal. One example of this is the starter cover--the husky, dolmar covers are plastic, the stihl one is metal. That said, I've seen some of the thin strands of metal on the starter covers knocked out in the same way that plastic gets knocked out, so who knows if it is really better or more durable.
chances are you're going to be looking at a 372 x torque, which is the strato 372, but doesn't seem to have lost any performance. Unless you can find a dealer with old stock, but it doesn't seem like there's an particularly strong reason to do that. The husky seems to have a narrower power band, but rocks with a 20" bar for hardwoods. That is one of the best setups. And it's nice and light.
I currently have a 7900. My biggest beef with it is that because it's shaped like a space ship, it's harder to get good, accurate felling cuts. When I went to do some serious directional falling with it of pine trees along a river, that all had to go in very specific places, it was very tough getting the lines right. A squarer saw body definitely helps in this regard. The weight is also a little bit different that most of the other saws. Not quite sure how to explain it.
The price on the larger stihl saws has really really creeped up of late. Apparently, unless my local dealer did some photoshop, the price on a new ms 460 with a 20" or 24" bar is up to $969.
At that point i'd take that money over to a reasonable husky dealer and get a 390 xp.