I have been getting quotes on commercial sized gutter install (6" .032" gutter and 3" X 4" .019" leaders/downspouts) and they seem high to me. Three different estimates between $1350 and $2075. I have about 80' of gutter in about six sections and 60' of downspout. Does this seem high or have I just not found the right guy yet? All I have been able to get out of one of the guys that commercial gutter install is about $4 per foot more expensive than residential. I don't want to come off as being too cheap but my neighbor who has almost the exact same house as me (same gutter arrangement) had his installed last year for about $770.00. Maybe less quality thickness aluminum was used?? has aluminum gone up that much in the last year?? I need some guidance, should I just run with it or keep looking?