I'm considering buying a new Mini-ITX computer. I currently have a 5 year old Fujitsu-Siemens (yeah, that long ago) Esprimo. I think it is 1.8Ghz dual core. It generates a lot of heat, and to be honest, I'm not sure how long it will live. It also has a DVD-rom etc. which I'm pretty sure I won't need anymore.
So... If I'm going to buy a new motherboard, I was thinking of something like the AMD E45M1-I Deluxe, which I'm already using as an HTPC, low power consumption, fanless etc. The problem though is that it won't be powerful enough to run HyperSpin, and it's an old motherboard, hard to find today.
That's why I'm thinking of a cheap S1155 Mini-ITX board + an Intel i3 3225 CPU. This has HD4000 graphics, and should be more than enough for this project. The price is a bit steep though, and I will need a different PSU... I guess a pico 150W should be enough, but it will quickly get expensive. Also as this is a one-person machine with an 8 inch monitor, I wouldn't want to throw too much money in it, then I would rather put some cash into a 2P-controller and a larger screen (I think I have a couple of 17" laying around) and build a tabletop instead.

Sorry for my rambling, but it's a bit hard deciding which way to go.
I do have a Raspberry Pi laying around. I might go that way instead, but that will require a lot more software-testing, and I'm not sure of how well it runs MAME?
Three options:
- Use my Esprimo computer. Will have to divide the power brick input to enable power for the monitor etc. Not a very powerful computer, but will run HyperSpin 90% perfectly
- Buy a new mini-ITX motherboard. Will most likely generate less heat, and be way more powerful at the same time. Will require either an internal PSU (way to big!) or a picoPSU + an external 150W PSU (another cost in addition to the $300 for a computer)
- Use my Raspberry Pi, which I'm not using for anything anyways. Will need a simple PSU for both raspberry Pi and monitor. 65W will be more than enough (cheap) and can be built inside the cabinet.
I'm leaning towards the Raspberry Pi. Less cost, less heat etc. for a small cabinet, and rather build a table top or upright in the future with brand new hardware (and more space).