I'll leave the front plate on, even I do prefer the looks without it. I see no reason to give the po-po any extra reason to pull me over (must have one in CA).
There is a member at s2ki.com that makes custom sub boxes that fit neatly into the side edge of the trunk, but he charges $175 for the box alone. For the cost of completely re-doing the stereo, I could replace my home theater speakers with some nice stuff. Doesn't really seem worth it to spend that money on a system for such a noisy environment. I could see saving up for some add-ons from Escort and Viper, though.