so as for a headunit, should i get
Kenwood KDC-MP442U (kdcmp442u) All In-Dash Car Stereo Receivers Car Stereo Receivers and Head Units Car Audio Car Audio, Video, & GPS Navigation - Sonic Electronix
or
Sony CDX-GT640UI (cdxgt640ui) All In-Dash Car Stereo Receivers Car Stereo Receivers and Head Units Car Audio Car Audio, Video, & GPS Navigation - Sonic Electronix
Kenwood KDC-MP442U (kdcmp442u) All In-Dash Car Stereo Receivers Car Stereo Receivers and Head Units Car Audio Car Audio, Video, & GPS Navigation - Sonic Electronix
or
Sony CDX-GT640UI (cdxgt640ui) All In-Dash Car Stereo Receivers Car Stereo Receivers and Head Units Car Audio Car Audio, Video, & GPS Navigation - Sonic Electronix