Wow, looks like a long list you got there. First off you should see if you can get your car straight first, audio will come second. We have a great audio forum also you could check out, or you can PM me if you want to figure out what audio equipment to install. (I’m partial to JL Audio subs and Alpine decks myself

Well, welcome to the world of Integras buddy

:
So you have 6000 dollars to spend total? I would wait on the stereo stuff and get a nice DC2 (94+) shell rather than the older G2 style shells. Then, since you stated that you don’t want to go forced induction and want to go N/A I suggest probably a B18C1 engine.
For the upgrades you listed there…seems like a good idea for a start. A good idea is to slap the mods on your engine before actually bolting the engine in, while you have the engine out, I suggest you replace the clutch, flywheel and things like that. It makes it all eaiser in the long run!!!
Remember there’s a lot of hidden costs with rebuilding a car, if you’re just building it up from a shell, you’ll need a lot more money and time before it’ll ever set foot on the streets
PM me anytime, and I’ll try to help you thru it all…

: