i personally dont like pioneer, many people do but i feel that the sound quality has been taken over by flashy graphics.
this is the head unit i would like and also recomend.
Clarion DXZ838RMP
CD/MP3/WMA Player with RDS Radio, 4 x 53W High Power Output, 24-Bit High Grade D/A Convertor, CDR/RW Compatible, MP3 & WMA File Playback with Easy Navigation Feature and ID3 Tag Display, Shock-Proof Read Ahead Memory, RCA Aux Input, 3 x 4V Preouts for connection of External Amplifiers (Front, Rear & Sub), Low Pass Crossover, Loop Back Circuit for Optional Dolby Digital & DTS Decoder, Rotary Controller, 3-Band Parametric Equaliser, Magna Bass EX Loudness, Aluminium Detachable Front Panel, 728 Different Illumination Colours, Supplied Remote Control
http://www.caraudiodirect.co.uk/shop/acatalog/dxz838rmp.jpg
such a nice head unit, clarion sound is really nice also not to harsh but very clear, i have an alpine cda 7893r and it is a very good headunit but i looked at the alpine range and couldnt see 1 with a aux in or rca in at all. the clarion has every thing u could need.