My Mac mini (1.42 GHz / 256 MB / 80 GB / SuperDrive / AE + BT) - $800.
1 GB Crucial RAM stick from newegg.com - $200 (RAM prices have dropped sharply this year, much cheaper now.

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Mac Wireless keyboard - $60
Logitech MX510 (after failed trial of wireless Apple mouse) - $40
Dell 2001FP - $530 (shipping/taxes included)
Acoustic Energy Aego2 quality 2.1 mutlimedia speaker setup that I've had for several years - $400
That's $2030 total, but I don't think my case is typical. My speakers and display cost almost $1000 and my Mac mini is about as pimped out as it gets. You can get a much cheaper display and speakers. If you are looking to get a fully-loaded Mac mini you may want to consider the iMacs. The recent revisions are great! I know many people would think I'm an idiot for getting this setup. I was very tempted by the iMacs, but I really hate all-in-one designs. So for as much as I like and praise the iMac G5 I just can't bring myself to buy one because I don't beileve in the concept. If AIOs are okay with you, I would strongly consider the iMac. I considered the entry level PowerMac too since I don't like AIOs but with 1 GB RAM, AE and BT it would have cost me $750 more for the PM over the mini. Since this was my first Mac experience I wanted the cheapest non-AIO Mac I could get - this is it. My next machine will be a PowerMac most likely.