Looking for an AH-6 huh? Heh heh, that line runs around the block! (http://www.finescale.com/fsm/community/forum/topic.asp?TOPIC_ID=17654)
There's been rumors of a reissue this year, but so far, that's all they've been - rumors. I'd love to have one too, especially after I saw a Little Bird this past tuesday (couldn't tell if it was an MH- or an AH-6, but it was indeed a Little Bird). Right now, your best bet is to keep an eye on eBay or if you'd be happy with an MH-6, find Dragon's 1/35 MD500 (kit #3525) and use Cobra Company's conversion set.
I don't know anything about the Fast Attack/Desert Patrol kits. Have you tried the armor forum?