M1
The M1-ATX (and its bigger brothers) would provide you both voltages regulated and startup/shutdown control with the ignition. You might find a better solution of two devices but if you get up to the $75 range to do them, this might be easier.
http://store.mp3car.com/M1_ATX_90_Wa..._p/pwr-008.htm
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2002 T-Bird, Via SP13000, Travla C158, M1-ATX, 1GB RAM, 120GB 2.5" drive, SlimSlot DVD-RW, XP, RR, Winamp, Xenarc 700TSV, HTC Touch PPC/Phone, BU-353 GPS/iG3, Elmscan OBDII, Griffin PowerMate, 2 Blaupunkt amps, Polk spkrs, 5 sec startup/S3 STR
~Jimmy
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