I have just lost almost 3 pounds and have more power than before. How do you ask? Sell your MS290 and buy a 261 ; it's that easy.
I don't notice any ported saws in your list... wanna get stronger, dial up someone who can transform your saw. The difference is staggering.
359 has had some work done to it. I am sure that there is more in it but wanted to go easy on it. I am a Stihl guy but have to say that this saw runs great! Also has a very distinct sound after it's wake up call. It will be getting more use.
I say yooperdave could think of someone who would still complain about the trigger being hard to pull.
Looks like $140 for it naked. Doesn't show how much with battery and charger so with that added I'll bet you are close.
Trigger is hard so Dave doesn't accidently cut himself pulling it out of his holster.  Sorry Dave , I forgot to say good morning first.
STIHL GTA 26 Battery Garden Pruner Kit (Battery & Charger) Item #7008545| Mfr #GA010116911| Store SKU #7008545D $179.99