MAYAman, like you I'm really happy with the Alabaster paint job (especially with our cedar interior) but even though it never came on any SRT's, It's been discontinued all together.
I'd love to pick up an SRT-6 while there are still some brand new ones left, and they're giving such great deals on them, but I'd hate to get rid of my '04.
Plus I'd like to get an Aero Blue coupe, and my Wife wants a roadster.
Personally I think the easiest way to change over to the Limited spoiler would be to locate a complete "hatch" from a salvage yard, and simply "hot wire it" to something, and hook it up to a manually operated switch.
I know the SRT's are supposed to have a much stiffer suspension, but it makes me wonder if it's really that beneficial. Going strictly by the magazine results posted in Road & Track Oct. '05 issue,

...Skidpad, g...Slalom, mph...
'04 Coupe...0.89...69.6...
'05 SRT-6 roadster...0.84...67.6...

I know a Coupe is going to be stiffer, and the Roadster is going to weigh more, but I thought it was interesting results.