I to say that Amigas are great fun as long as they're running OK, but my systems seem to be so patched now that keeping them running smoothly can't be a major pain in the arse. My A4000 with its combination of Zorro and PCI cards as been known to throw a major wobbler at times when you install a new program or update a driver. The best thing about an Amiga compared to Windows is a "backup" just means using DOPUS to copy one hard drive to another and "restore" is just doing it in reverse.
Minimigs are a joy to use. SD cards full of ADF files = no read/write errors. 
yeah. no doubt. I had a 1200tower with g-rex and it was like that...
My current 1200/060 is no issues. The Indivision AGA MK2 really makes the system, although the DVI has one worked 100% on one monitor I have tried, but that will get better I'm sure. if it gets the graffiti support that will be sweet. I tried to run the graffiti software off aminet. does not seem to work.
I won't ever build up another classic though.
My Minimig 1.1 is totally reliable and that is the future... I only miss out on a few things that need 020 CPU instructions, but I can't wait for the 2.0 and 060 daughter-card. I know it will put my 1200 to shame.
I hope some day they make a daughter-card with PPC/060 combo. That would be interesting.
