Been studying bigger saws lately, so maybe my .02 isnt completely worthless.
I dont really get the 576, might as well get the 390 for a little more weigh but a lot more CC's/power. Or go with a 461/7900 for basically the same weight with more torque for longer bars.
It is my belief that in the hands of the right porter the 390 will cut with, maybe out cut a 660 and be lighter doing it.
The 395 is a man saw for sure but if you are running anything less than 36" bar I think the 390/660 would be the smart choice.
I have a 24" on my ported 372 and it handles it no problem, full comp hard woods only. My $ for a saw that sees 24" bar 75% of the time or even 28" with the occasional 28-32 would be on a 461/7900/390. I have not run one but I just dont see the 395 cutting that much better with a 28-32" bar than a 390 to be worth the weight.
Good luck with your choice