ATI makes mult-channel amp and they are assembled in California. Several of them are on Audiogon for sale. I have a 1505 and have been happy with it. It is a solid piece of equipment.
The McIntosh amp would be one in a small group that would show the least amount of wear. If you find it has a problem there are many repair shops that specialize in Mc.
ati, acurus, aragon, emotiva, and outlaw immediately come to mind as affordable american made amp makers. the older, original five channel aragaon's are harder to come by and sell for more than $1200 used from what i recall.
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