well it all depends on how much money you want to spend. It also depends on whether or not you will be keeping the stock head unit. If you keep the stock head unit you might lose even more sound quality because you have no pre-outs so you will have to use speaker wire inputs to the amps. Bose is always a little tricky because they design speaker locations for the specific car. They also make the amplifier specific for the speakers. Everyone thinks OH Bose but infact when coupled with after market amps they suck. You can't go wrong with Alpine or Kenwood Excelon. For speakers stick with speakers that have a low Hz rating and high HZ rating. The front doors have 4 inch speakers in them so I would use the Alpine SPS-10C2. They are very good speakers. The back doors have 3 1/2" speakers and I would use JBL GTO327 3-1/2" Amps Stick with the brands above. If you keep those stock speakers in, you will lose sound quality by switching amps.