Hey, I personally have had a few different subs, amps and enclosures. But, of all the subs and amps. JL has the best quality of the ones I have heard. I am not sure the type of music you listen to, but I love rock and personally love the way a few 8 or 10 in subs sound. The box is a very important part of the decision... but deciding which box you want should come after you decide what size sub you want. Look at the amount of space the box's say you can get for your vehicle and look at the subs smaller than that. When you find a sub that you like, then try to find the best box for it. BUT, if you can't find a box you like... that is not the end of the world, it is pretty cheap to have them custom made. They are not complicated to make and you could make one in your back yard if you have the proper tools (My friend made 2 as a high school project). One box which was ported, so it has holes in the box for better air flow. The other was not which is best when you have lots more space.
I hope this helps. I can't really speak for subs and box's for tahoes as I have never heard a system which is in one.