I was also going to get a mac mini and did a little research on them. they are perfectly fine computers, and very small. but the down side is there is really no were you can go with them, what I mean is that you will have a hard time upgrading it because it is so small.
I would do a power mac g5, or you can do an imac g5. both of those are pretty new good stuff, the imac is like a computer monitor all in one, super easy to set up, and the power mac is like a regular computer, and monitor.
check out apple.com for more info on that.