I have the slightly tuned up 620P version of that (fancier carb, better cylinder, wrap handle). It's a nice saw no doubt. I find it's actually pretty comparable with a 24" bar to the CS501P with a 20" which was surprising to me, I had thought the extra 10cc would've given it a bit more oomph (to be fair the 501 wouldn't pull a 24" bar well at all.. it's just that at 24 the 620 wasn't hugely punchier)
IMHO It's not nearly as much saw as me older (early 2000's) husky 372XP. This is a pre x-torq / autotune saw so I'm not sure how much that changed things. The low end torque on the old 372 is just way higher compared to the echo 590/620P... But the 590/620 cuts quite well if you keep the RPMs up and the chain sharp and it's a bit lighter which is nice at times

. The echo is also a bit easier starting on your average day. But when I want to get through a lot of wood I'm pulling out the 372 or something larger...
I think for OP with a 30" tree I'd be looking at a 70cc saw heavy bucking and maybe consider going one size up from that if I had the funds although the weight starts going up there as well. New that would be in the 372XP or 572XP class (or equivalent Stihl) or maybe the 592XP. The 372 is lighter and has a bit less gew gaws than the 572 so between the two that'd still be my personal choice. Maybe an Echo CS7310P would be a decent option, I haven't tried that specifically since I have other saws in that class, but I'm pretty happy with my smaller echo's. The Stihl 500i punches a bit above it's weight in power and cc's but also price, I'm also a touch allergic to all the electronic gew-gaws which is why most of my newer saws are echo.
I'd also want a lighter smaller saw for limbing and ground work, the echo CS590/620P isn't bad.. IDK it might be a decent all around saw here if you're not in a hurry.... (probably skip the wrap handle if that's your main use).
The echo 501P is probably a touch small depending on what your limb situation looks like (and how much you don't want to bend over.. running a 60+-cc saw with a longer bar means you can stand up more less bending..).. but I use mine a lot for smaller woodlot work (12" and under it does great and fits nicely on the tractor, a 20" bar is about right for convenience/reach trade off there). The 550xp is in about the same class as the echo 501 albeit maybe a touch punchier. Both of those overlap some with your current saw though so I suppose it depends on how much life you reckon you have left in that one.. but I'll often use 2-4 saws on a job just to save the wear and tear on myself by switching out to the smaller/lighter ones where it makes sense
Another vote for going to a pro line saw vs farm or homeowner. The pro saws are built better and are almost always lighter for the same punch which is real nice at the end of the day.