2001 GS300 w. mark levinson package

So i bought this GS300 and i was pretty content with the Mark Levinson audio system. I did my research and my car came with a few TSB's regarding faulty amps, etc and so forth. Ive been experiencing those problems, i first blew the stock sub and replaced it with a 10" JL sub. ive located the stock amp, and now my KEY question is, DOES ANYONE KNOW IF THERE IS AN AFTERMARKET IN-DASH FOR MY CAR? Ive never ran into this problem before, my in dash controls the audio setting, rafio, GPS navigation and my A/C. my friend had an idea of buying the factory a/c and radio units off a non mark levinson system and going from there. But is there another way to go? Is that the easiest way? I live in San Diego so anyone that has ANY information or a place thats familiar with what their doing is greatly appreciated. Thank you