Re: Seeking advice on upgrading stock system
I would get a set of 6.5 components and a nice 4 channel, as for nice HUs there are alot of good ones just look into Kenwood, Alpine, Eclipse, Pioneer and Clarion and find one that has all the features you're looking for at a price you're willing to pay. Since you said you don't want a sub right now I would get a pair of these Tang Band W69-1042J 6"x9" Subwoofer and run them infinite baffle in the rear deck it should do a nice job of filling in the lowend.
You will really help your sound quality if you properly seal and deaden your doors and rear deck if you want to run some IB subs.
Bought from: Misfit138, Nateberrier, Loudrc, Jarvisb, DMP, RAM_designs, go_go_thrash, alxmlr789,imjnotu
Sold to: Lazyrider, TaylorPro, AJM511, Energizedsbs, diarmer, sobe3yourself
Traded with: Vitveet, Resko1 x2, Suicide Bobb, Dumple
More that I've forgotten now and some more in progress