AFAIK, Apple doesn't really want to advertise the Mini yet. Right now they're having enough problems trying to meet demand, there are many curious folks with $479+ to spend on a Mini for their second or third machine. It's not exactly the switcher special right now, but it's a good deal for a certain segment of the market. I bought one for my grandpa as a drop-in replacement for his old Pentium 2 based system and he's loving it.
Regarding the VIA EPIA boards with the VIA C3 processors... there are some really slick cases, but even the smallest Mini-ITX cases are mugh larger than the Mini. In fact, even the Nanode (a tiny case made for the upcoming Nano-ITX) is still larger than the Mini. And frankly, C3 performance sucks. My little EPIA is an M10000, which means it has the newer faster Nehemiah chip running at 1 GHz. I think the current fastest model is 1.2 GHz, so I'm close. Anyway, it runs no faster than my 500 MHz P3. Seriously. It's great for surfing the web and using MS Office (and even Word takes awhile to launch on that CPU)... but that's about it. There's no way it could handle an app like Garage Band like the Mac Mini can. And heck... all VIA EPIA systems use integrated shared memory "DeltaChrome" onboard suck graphics. This hurts CPU performance and kills the already poor DDR266 memory bus. Even the Mac Mini has a real GPU with real dedicated graphics memory.
This is the case I have for my Mini-ITX system, I think it's pretty sweet:
http://206.14.132.88/products/Travla/c134/C134-Images/sC134-45d-600.jpg
It's the same height as the Mini, but an inch wider and about 4 inches longer. It still requires an external power brick and it requires really expensive low profile DIMMs.
Check out the prices, Mac Mini is cheaper, faster, and comes with a load of software.
http://www.logicsupply.com
What I'd really like would be a Mac OS X compatible G4 ATX board. Even if Apple charged $300 for the board + CPU I would be happy as long as I could use a generic AGP ATI or NVIDIA graphics card. Even better would be a G5 ATX board but I think Apple would be worried about that eating into their G5 tower sales.
I think I'm just kidding myslef with the ATX idea.... I don't think Steve Jobs would ever sell just a board because he knows it would end up in one of my beige Enlight ATX cases!
