Nice Synthesizing
I love the contrast you added. If I was any good at it, I would totally write this out for you in an actual orchestral score (since you did an amazing job using real instruments in the synthesizer!). Unfortunately, Finale 2005 is not fun.
I like how you used both the melody from the slow AND fast versions (since they're just a bit different in rhythm), also, the REALLY low piano was good, too; Area 51 (Infiltration X I think is it?) has that in there. They're probably my favorite two songs of the entire game, unless you wanna try and add Deep Sea X in there as well.
The name of the level you used the music from is actually (as swordskid said) is Crash Site: Confrontation, but I think the title you chose works well anyways, since you changed things up in the music.
All in all, good piece.