If you are going to buy stihl get the 600. I don't know why they still make the 500 and the 550. I'm pretty sure they have the same motor the difference is the squirrel cage on them. If you are going with the husky get the 570 or 580. From what I've heard on here the 580 is better at volume the 570 is better at get leaves that are stuck in bushes or vines. I have a BG 13hp blower that I got used. Great blower but if you have the money always get the biggest blower you can. I think you can get the BG 18hp VG for like 2800.or the 13 for like 2300.
Cheetah 61in 34hp
Vride 48in 24hp
Trac vac leaf loader 16hp
Billygoat 1302sp blower
Stihl handhelds/322l & 580BTs husky
2003 GMC C4500 14ft dump
1998 Chevy 1500 Z71 with 8ft EZ dumper
2003 GMC W3500 18ft box cabover
6.5x12 landscape trailer
Jrco leaf plow
Part time for now and solo for now.