For $350, i'd get a new headunit and door speakers, and save some more money and add a sub in the future. that's pretty much what I did. I picked up a used headunit (sony CDX M600) and 4 pioneer 6x9's for under $300, oh yeah and an amp bypass fro mcrutchfield. Sounds good for what it is.Now all I need is to get the sub installed in the trunk and I should be set, but i'm thinking of going all out and redoing everything, either way i'm not out alot of money.
However, dave is th emost knowledgeble person in this forum, I don't think he would steer you the wrong way