The MS260 has been replaced with MS261.
The 357xp small mount is being replaced by 562xp large mount
290 replaced with 291
310 replaced by 311
Best money for the buck with auto carb tune for a homeowner with pro quality build husky 555 replaced the 359 in homeowner non xp saws.
The 555 is a small mount non xp saw like 560xp without the rev boost. Light and super fast cutting per a tester on Chainsawrepair. He said he sold the saw after all the testing for $475 shipped. 555 outcut the 357xp easily.
If you get another MS290 I seen they were on sale for $369 with so called free case. If you would do a simple 30min muffler mod and carb retune you will gain min 20% faster cutting speed with the stock rm? chain that comes with them. If you would slap on a stihl rsc chain you will gain about another 40% quicker cut. So you see it is easy to gain 60% quicker cuts for little time and good chain. Square file that rsc to a rslk and you gain another 10%. I seen 73% faster cut times with a stock MS290 I started with once after mod and changes.
I'm not a fan of a 290, but if your going to run one open it and make it run right, not the epa slitted muffler crap they sale you.
If you can find a MS361 new left over or used ($589 new, $300-$350 used) that was my favorite stihl in that range 59cc and cut circles around a 290 310. I would go used 361 all day over a new 290.