Aren't those onkyo amps all separates though?
Most cheaper all-in-one kits come with a built-in DVD player and offer limited connectivity for external devices like your PS3 and HD box. Separates offer a wider range of connectivity options, but are generally more expensive.
Sony have a few speaker/amp packages available though which offers the convenience of having everything in one package, but the connectivity of a separates system:
Home Cinema SurroundÂ*kit : Home Theatre and hi fi : Sony
You will also be able to get HD audio from your PS3 with some of these as long as they accept multi-channel linear PCM audio (i.e the decoded HD audio signal which the PS3 outputs).