I saw that enterprise IV on ebay. It looks like a pretty nice board. AMI is pretty much cream of the crop for quality.
But the previous poster is right, you have *almost* nothing to gain unless you have EISA cards. That being said, EISA SCSI controllers and network adapters are pretty easy to come by. What makes EISA so attractive to me on a 486 is that it is really the only option for 32-bit expansion cards if you want stability and bus mastering. (MCA is a good bus too, but way too proprietary for practical use).
VLB works quite well for graphics adapters as they do not really require bus mastering (at least that is my understanding). This makes it somewhat unsuitable for high end hard disk controllers. However, you can somewhat get around these limitations by using a caching controller with lots of RAM. The other major drawback of VLB is that it is usually poorly implemented, causing potential compatibility problems and interference which can lead to data corruption. For all practical purposes, you can have no more than 2 VLB cards in a machine at a time.
PCI when used on a Pentium is a great 32-bus, but not so much on 486 systems. PCI came on the scene pretty late in the 486 game, so most efforts at producing a good PCI 486 system were half-assed at best. For the most part its bandwidth is severely limited, and I'm not sure that bus mastering really works at all (at least it the majority of cases). The main attraction of having PCI on a 486 is that you have an excellent selection of late model graphics adapters to choose from.
If all you want to do is enjoy classic DOS games, then EISA is not worth considering. If you are trying to build the ultimate 486 and really like playing around with old hardware, EISA is definitely worth exploring.
"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium