Definitely get a commercial mower for longevity. Was your Hustler going to crap already at 400hrs? Was it a low end residential unit? I have never run a gravley, I have a used 48" Ariens with 300-400 hrs and I can't remember the motor brand. It had a fabricated, not stamped deck but it was a piece of crap, cut well but the hydros were already going bad and couldn't handle and incline.
There is an Old Blue Chair for each and every one of us, we just have to find it.
2006 GMC Sierra 2500hd crew cab
BOSS 8'2" Power V
Hustler X-one 60"
Toro Proline 36" wb w/t-bar controls
JS46 22" walk-behind (wouldn't recommend)
Shindaiwa T254, Echo trimmers, chainsaws, pole hedge trimmer, pole saw, hedge trimmer
Shindaiwa 633 and Husqvarna 130BT blower