My Zotac comes with a windows Media Center remote. It's nice and small but runs on a pair of CR2032 batteries.
I picked up an AD10 bare system for $109 + $35 for memory, and $15 for a 8gb USB stick. The OpenELEC can run off the USB and it grabs all my media off my NAS via the 1000BaseT ethernet
I also have a couple of the ID80's with the intel Atom D2700 2.13gh 2 core 4 thead. GeForce GT520M video.
I use one of these for my JRiver and link via optical to my receiver for music. Also run my PVR off this with a HDHomerun.
Axiom: ADA1000, LFR1100, VP180, QS8, EP500, M3, M3comp
AudioSource: Amp One/A