Do you know when they will be in stores?
Not sure, I would check/post on the Dahon forum for availability.
but the $950 Red is Deore, which isn't quite up to the SRAM X7 set up on the Jetstream.
To be honsest, I doubt that you would be able to tell much difference. I know some people prefer the SRAM 1:1 actuation ratio, but YMMV. I swopped out all of the Shimano drivetrain components on my Birdy and replaced them with SRAM X-9 and X-0. Whilst the SRAM mech/shifter etc were lighter, the performance was only marginally better (more positive feeling shifts). However, the cable routing with a Sram derailleur is different to that of Shimano (it protrudes more to the side) and after repeated folding, I found it harder to maintain the crispness when shifting to 7th/8th/9th gears on my Birdy. I attributed this problem to the additional strain placed on the obtruded cable when the bike was folded.