Tony - I think that suggesting that "DLP gives everyone headaches" is rubbish if you don't mind me saying so. Some of the early DLP projectors did do this to an extent but that does not happen so much these days, with faster colour wheels etc.
I've been using DLP for 3+ years without a single headache! And without the 'chickenwire' effect that some LCD projectors give too.
I like the sound of the Arcam, although it does not scale the HDMI output so you are still at the mercy of your plasma or projectors own scaler.
Paul