I think a Mac Mini would be alright, but it does have one big negative - the Intel GMA 950 graphics. Personally, I use a MacBook, which has the Intel GMA X3100. It's still not a great graphics solution, but more stuff seems to work with it than the older 950.
I'd strongly suggest that you check out the refurb section on the Apple Store website. Last time I looked, they had a refurb MacBook for $899 US and a Mac Mini for $499 US. The refurbs have the same warranty as the new ones, so all you really lose is the pretty black box (it's shipped in a brown one instead).
Oh, and on the PowerPC side, I use a Mac Mini. It was my primary dev box for a long time, and still works great now.
I'd strongly suggest that you check out the refurb section on the Apple Store website. Last time I looked, they had a refurb MacBook for $899 US and a Mac Mini for $499 US. The refurbs have the same warranty as the new ones, so all you really lose is the pretty black box (it's shipped in a brown one instead).
Oh, and on the PowerPC side, I use a Mac Mini. It was my primary dev box for a long time, and still works great now.