I say yes to the DSP modes. If it's not going to cost anymore then why not add them. I own a Yamaha receiver that has a multitude of DSP modes. I rarely use them for music but I love the different Theater modes and use the different modes depending on the type of movie I'm watching. My interface is not 'cluttered' at all. In fact, all of the modes are selectable from the front panel or through via the remote control. Just make sure that if you use DSP modes that you make their functions available directly instead of toggling.

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"Nevah underestimate the powah of the Dahk Shyde.."