now that your in this saw world and buying saws just to have ill throw out my recomendation for you next saw.
id recomend a 359 along with some porting tools, you could make that thing run with your 046 and have less vibes and be noticably lighter.
i ported my 359 and it freakn runs, ive got 24" bare on it and it puts a grin on my face every time it drops through bar size wood likes its hot butter. the ported 359 wwould realy amaze you and many on this site.
i know there talked about being ported and running well but believe 90 percent of ASS members realy have no clue how wild this thing is.. its my play toy saw and does work to. ive cut lots off 24" even 30 plus wood and it doesnt quit.
i also have stihl 310 its not a bad saw. a muffler mod woke it up some and its running a 25" bar wich i feel is much to long for it.
ive also got muffler modded 026 wich is alittle smaller then a 290 ive muffler modded mine im pretty sure with an 18" bar itl be much lighter and run right there with a 290.
these thoughts come only because you just got the saw just because, might be the first sign of CAD