I already sold my GTS... but not to make room for the SRT.
It's doubtful I could have kept both - I had 4 bikes and 4 cars when I ordered the SRT, and another car would be too much. I would have sold my GTS anyways to get the SRT, but I would have bought another GTS later on.
The way I look at it, the GTS will always have a special place in my heart - someday down the line I will look at the entire run of GTS's and pick one that appeals to me the most and keep it for the long haul. Right now, I'd have to say that might be a black/silver '99..