I think you're going to want a Carnetix P1900 or P2140.
"Good sound quality" is relative. What I would consider good SQ would make true audiophiles vomit, I'm certain.-I want this system to have good sound quality so i am going to need an external sound card and a 4-channel amp right? How much power will i need from the amp? Recommendations please
I suggest giving the built-in sound a try. If it's acceptable to you, then great. If not, it's not all that difficult to add an external sound card.
Nope. See above.-Will the OPUS do all the work with powering my system or what will i need in addition to that? Will it work with the MacPac?
That will inmprove your sound quality immensely. My setup (when it's installed) will include an AudioControl Three.1 for that very purpose. It's a simple device, and small, too (1/2 DIN). It has fader and balance control, bass adjustment and a comparatively small EQ. It also boosts line levels, which will help combat system noise somewhat as well as provide a strong signal to the amplifiers.-I would like to have control over my sound that i can mount in my dash like a sound processor with an equalizer and crossover but don't know which one (looking at Clarion EQS746 and Soundstream MPQ-7XO) Recommendations....i don't want it to be too complicated that i wont be able to work with it
Both of the units you specified will accomplish the same thing, and will likely do you well.