steel pan windows need replacement

[George P.]

brick ranch house, about 60 yrs old. original windows are steel with steel pans (attached with metal clips to the studs).

Have been getting quotes from 6 contractors and the price is from $4500 to high of $5300. this includes cutting the steel pans off, building a wooden frame, foam insulation, alum trim outside, wooden sill inside and trim inside.

contractors act like this is impossible job to handle and i think they bid too high.

I priced basic American Crafstman windows at HD and it came out with LowE and Argon to $2400.

they quote Excalibur windows and i know they are paying less than 2k.

does $4600 seem like a good price? what do you think?