Nice

Now all you need is:
3.1 ROMS
A graphics card
and a 060 (which can be had at half the price of one for the 3/4k)
A decent scsi/ide controller.
There are some on-line shops still carrying items for the miggy. Check
www.powerc.com,
www.vesalia.de, softhut.com, kdh-datatechnick, or ebay.
As to whether it is worth the upgrading, I would say do it for the fun of it. Wont beat your average PC, but you can still get a good feeling from using a nice miggy.