Onkyo would be best and cheap so you can try in it.Hmmm....Well based on your feedback i guess i need to buy a home theater with Coxial cable for my TS HD+....
you can get moderate quality decoder at 4 k.You can do one thing.You can buy a 5.1 or 7.1 decoder and add it with your existing HT.But I think this decoder price will be 7K plus.But I dont have personal experience about decoders so dont know how they will work.