Well!
After reading a 167 page thread (each with 25 replies) on the AV Forums, I have worked a few things out.
First batch of A321's went to a well known supplier. This was back in may, they sold out of them around mid June.
The second batch to this supplier had fixed the HDMI problem. All original sets came with a DVI, despite the spec saying HDMI. From the second batch on, and all batches to other suppliers (including OCUK) have a HDMI socket.
The HDMI socket has been Sky approved and Sky say this is one of the best 32" panels they have tested.
The lipsync issue is mainly limited to the Q321. It affects the built in freeview and most other sources. Some people get it, some don't. The A321 has had very few reports of this problem. The engineers are sure it's a signal problem, rather than a problem with the set. However, it is still more apparent on the Q321 than the A321.
Virtually all lipsync problems are non-exsistant using a seperate amp and surround setup. Since this doesn't get mentioned for the A321, I have to presume it to be a poor digital signal or poorly setup equipment. Thousand of people have had no problem on the A321. Yet, the A321 thread still has people complaining, months on!
After reading nigh on 3000 posts on this, I still wanted this set. So have ordered! Sure, there could be problems, but in 3000+ posts, about 10 said they had issues, which Hyundai are very keen to sort. Have not been put off and should be getting this set tomorrow. (A321, not Q321 BTW)
Can't wait! Everyone says it's superb for the money.
Thanks guys!