Asus Xonar HDMI Sound card (3 models!?)

[Schizophonic]

OcUK sell three models:

Asus Xonar HDAV1.3 Slim Sound Card
Asus Xonar HDAV1.3 Sound Card
Asus Xonar HDAV1.3 Deluxe Sound Card

In terms of the processing and technology on each of the cards, are they really different from each other?

I'm planning to buy one to fit into my new HTPC that goes into Demon 1910 Amp and would i have a noticable difference when i play mkv or blue ray movies?

 

[Schizophonic]

any one?

 

[Schizophonic]

Slim only has HDMI and S/PDIF (though it has a header for front panel analogue), standard adds a line-in and stereo outputs, deluxe has full 8ch analogue output.

Thanks for.the info. I'm not really.interested in the analogue 8 channel. It's all connected via hdmi so would I get.the truehd and other .stuff with the slim card?