The best AOD transmissions out there come from Lentech Automatics (
http://www.lentechautomatics.com). They sell their Street Terminator for $2000 and it's rated for 400 hp at the flywheel. Their Street Terminator Plus goes for $2500 and is rated to 700 hp. Also, all trannies have a 1 year unconditional warranty. They come with a redesigned valve body which allows full manual shifts from 1-2-3 with and electronic OD delete. The transmissions come with a Lentech built converter as well.
It's hard to beat them for the quality and performance. They've got guys in the Mustang ranks running well into the 8's and probably lower in the 1320.
Besides them, their Performance Automatics (
http://www.performanceautomatic.com). They make a fairly nice tranny as well.
--nathan
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'91 GT, Coast 347, 9.5:1 compression, full intake, Wolverine 1087 cam, exhaust, Keith Craft ported Windsor Jr. Irons (235 cfm intake, 195 cfm exhaust), AOD, PI 3500 converter, Lentech valve body, 3.73's (4.10's in the works), and Yokohama ES100's out back.
Daily Car: '04 Infiniti G35 Sedan 6MT