Stereo wiring question

[bad68bowtie]

I've been trying to update the stereo in my truck for about the past six months now, a po put the speakers in the glovebox and installed a worthless tape deck and all other nonsense that I'm working on getting rid of. I got the panels to put 6.5"s down in the kickpanels and a pod for 4" in the dash spot and I have my eye on an Alpine headunit.

I don't know much about wiring up stereos and don't have any experience with them. I'm a little puzzled by the wiring setup thats in there now with the tape deck (the deck is some old Radioshack unit) and how I should go about wiring up the Alpine when I get it. I've got a couple pictures of whats in there now and any examples of what y'all are running and advice as to how I should wire the thing would be awesome.

heres the back of the deck-


and the receiving end that runs into the wiring harness-