When your 450 isn’t big enough, get the 460. Its the biggest non commercial saw that Husqvarna sells.
I’m still really happy with my 450 but I added the 460 to the fleet when the 450 needed repairs. The 450 was quite literally pouring oil out the bottom.
The 460 has a few advantages though. It has 3/8″ pitch chain versus the 450 has 0.325″. That is a common pitch and it can take a little bigger bite than the 0.325. The larger engine offers more power and the longer bar (24″) allows for bigger cuts and easier limbing work.
I also made the mistake of purchasing my 450 from a big box store. While there’s nothing exactly wrong with that, the local dealer was the same price and far more helpful when picking out a saw.