Gosh this is a tough one. You already have an amazing collection of games. I kinda think you should stay away from MET if you think the music will bother you.
Now you are at a similar delima that I am of you exclude MET. I love Jurassic Park but I'm a little afraid of Sterns quality at the moment and that's the only reason I dont already own a JP. That leaves me with AFMR and MBR.
I played a AFMR the other day and i gotta say that it is really really really good. I think i enjoyed as much as JP honestly but its obviously not going to be as deep with rules as JP is.
If it was me and taking everything into consideration I would go with AFMR and if you get a classic be sure to get the color dmd upgrade chip for 400 bucks. That puts you at 6400, if you can afford another 1K get the SE model with the bigger display, upgraded toys, and upgraded sound package.
You can always get a JP at a later date because it will be made at least two more years. If you're a rules nerd then get a JP. If you arent then get the AFMR. You are a winner regardless of which game that you choose.