Really comes down to a couple of factors.
- What your budget is.
- What features you want.
If your budgets low, i.e: around 150 quid...then you have a choice of Openbox/Solomend/Skybox HD recievers...No frills basic functionality.
Or DM800HD clones, a lot better better fuinctionality than Skybox, better specced box (broadcom CPU etc). Enigma 2 images...probably the biggest support community of any HD reciever. But be prepared to potentially have glitching issues with certain HD channels..this is hit and miss..some people have no issues...others do..
Or theres a whole range of closed source non linux recievers...spiderbox, Blademedia, GGG box etc
- If you got cash to spend i.e: 360 quid plus, then look at ther VU DUO, twin tuner with good support gets decent reviews.