I would get a tape deck with a CD changer. The changer is always nice to have, plus you will have much wider selection of HU's to choose from rather than a double DIN HU. As for the best systems regardless of price, in my opinion Alpine has the best head unit - Xtant, Alpine, Rockford or PPI for amps - Boston Acoustic, Focal or MB Quart for mids and highs - Rockford Punch Power, Boston Acoustic, Cerwin-Vega Stroker, Infinity Perfect for subs. There are 100 other brands that I did not mention, but these are my favorite. What may help is to pick up a few Car audio mags with competition system installs and check out what the pro competitors are using. The mags also have good product reveiws.