As far as Oric Atmos clones go, the Bulgarian Pravetz 8D must be the most interesting I've ever encountered. It was first released in 1985, sported 48k of RAM, 16k of ROM, a pretty standard AY-3-8912 sound chip, decent graphics and a most reasonable price-tag. The micro could be connected to a TV, cassette player and even a disk-drive, while retaining its compatibility with the Oric Atmos. Oh, and it's quite an obscure rarity too these days.
Happily, you could grab one via this Pravetz 8D eBay auction. The computer is in working order and the seller is shipping to both the USA and Europe.