I'm going to replace the Head unit with a Kenwood DNX5120 in the next few months. While I'm thinking about it, I figure it might be a good idea to replace the front four speakers (I read that it's not worth dealing with the rear speakers in this car). Does anyone have a good suggestion on some good sounding speakers?

Also, is there any suggestions on putting in a subwoofer that doen't take any trunk space? I'm not sure if one would fit under the seats, so how would one in place of the spare tire sound? I prefer a flat, neutral sound and not something bass heavy or bloated.

Thanks.