Depends on what you’re looking for exactly, but if it’s mostly going to be used in a tree, look at a 462 with a 25” lightweight bar. It won’t feel too much heavier than your 261, but it will positively rip with that 25” on it. It will also be big enough for most of your felling and bucking, if you need bigger just rent a 661 with a 36” bar somewhere.
We run all Stihl Lightweight bars, well worth the extra expense when you’re running them all day. We also run RSK series chains on all our saws, those chains are far more aggressive and faster cutting than the RS or RM chains that most use; you’ll likely have to order the RSK chains though, your dealer probably won’t even know what you’re talking about when you ask for one.