Alton is a reseller of PC-Chips and ECS stuff, and the latter two are the same company nowadays.
PC-Chips has been making very decent all-in-one boards for quite a while now. From the nature of all-in-ones where you have to get everything right in one go rather than install stuff one at a time, they require some experience to get them set up right (definitely not for first-time DIY). But once that's done, they're perfectly fine, and the value is yet to be beaten.
In particular, the M810LMR is all over the place, and even those of my local resellers here that wouldn't go anywhere near a PC-Chips board previously have it and use it for their own retailer brand boxes ...
Make sure you use an AMD approved power supply unit and a well tested DIMM. Shared-memory VGA boards, especially Athlon/Duron ones, reveal surprisingly many not-really-OK DIMMs that never showed a single problem in the less demanding system they were previously in.
regards, Peter