looking for a new deck

[fijisac916]

i currently have a Sony CDX GT340 single din deck but i was told from a few people on this forum that i should upgrade to a deck with 4 volts pre-outs so far this is what i have found. tell me what you guys think.....

Clarion CZ500

http://www.sonicelectronix.com/item_23447_Clarion-CZ500.html

Kenwood eXcelon KDC-X494

http://www.sonicelectronix.com/item_22937_Kenwood-eXcelon-KDC-X494.html

Pioneer DEH-P8300UB

http://www.sonicelectronix.com/item_31077_Pioneer-DEH-P8300UB.html

Clarion CZ501

http://www.sonicelectronix.com/item_35579_Clarion-CZ501.html

Pioneer DEH-P7200HD

http://www.sonicelectronix.com/item_22379_Pioneer-DEH-P7200HD.html

JVC KD-R900 - this one have 5 volts

http://www.sonicelectronix.com/item_17639_JVC-KD-R900.html

Kenwood KDC-BT945U

http://www.sonicelectronix.com/item_22916_Kenwood-KDC-BT945U.html

Alpine CDA-117

http://www.sonicelectronix.com/item_24406_Alpine-CDA-117.html

Pioneer DEH-P5100UB

http://www.dealercostcaraudio.com/pioneerdeh-p5100ub.aspx

i did find a couple of Sony decks that had 4 volts pre-out but there really is not enough features to dial in the system like a pioneer deck would have....

i just your guys opinion on these deck so i can lean towards one for my new system build, thank you...