I don't think the macs were 'so expensive' because they were so 'excellent' quality - I think it had more to do with going to a 'closed box' system, upmarket pricing from PCs (e.g. they HAD to charge that much because they were selling fewer computers at first vs. the Apple II/III and had to stay in business, after all) and immediately leaving behind their hardware-hacker consumer base that used the Apple II, which then realizing that apple no longer cared about them, moved to the PC because they could again hack the guts of the computer.
The Apples were better then comparable PCs of the same era but I don't know if they were better than any comparable Amigas, save maybe the Amiga 600, because I've been running a webserver on an A2000 for over 2.5 years with virtually no interruption and virtually no problems, either - that's quality for you - how many 14 year old Macs (and definitely PCs of that era, ha!) can say the same?
I think Amiga500's were pretty darn durable too, they just weren't that expandable without paying quite a bit of $$ at the time...
kevin orme
amiga university
www.amigau.com