most powerful handheld?

I realized the other day that I never leave without my leaf blower... It's old but works. Next year I am thinking about buying a higher power hand held I don't want a backpack that's to big and unnecessary for what I do. I think a handheld with a vac attachment might come in handy once in a while I'm not sure what I am looking into I'm only looking at echo and stihl because of local dealers are close.

Also does anyone use the shredded vacs professionally for tight areas or small jobs? Is it convienent I realize I won't be vacumning whole yards but think that the feature could come in handy some times