Install Linux on your PS3 and that's what ya got right?
Hmm, this might be a silly suggestion but as the PS3 is PPC-based and has now had the other OS feature hacked. Couldn't Hyperion finish porting OS4 to it, put the PS3 hardware in an Amiga branded case bundling it with OS4 and maybe adding 500gb HD,keyboard etc., then sell this as a fairly decent computer(the X500?) which is also fully compatible with the playstation.
Even with all the peripherals I'm sure it could be sold for under £400, so it would be a cheap and powerful alternative to both and the games are already there.
Not sure about the legalities of that though.