Damn man sorry to hear/see that, I love your car...If I were in the same situation here is what I would do, or at least some of my options I would consider:

A. Buy The Car Back, Get a few quotes on how much to fix (but Im assuming around $5k to fix so probably not worth it)
B. Buy The Car Back, Take off all parts sell everything you can possibly sell and look for another car (something that will make you as happy as your GSX)
C. Buy The Car Back, Look For Another GSX/GST, Put everything you can on it from your GSX (Aftermarket Wise And Other OEM Parts it needed) and then sell the Misc. other parts for a little extra cash.

To be honest No matter what I would buy the car back, cuz its your baby. If it were me I would regret not trying to anything with it at all and having some BANME! in a junkyard taking all your parts...butthis is just me...