That thing looks like a beast...IS a beast. If you go with anything less, then you should just stick with the X5. Although IMHO I think BMWs are much better and can still carry everything you would ever need it to.

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Lemans Blue X5 4.8is
Dynaudio
Diamond TDX 12" subs x 2
Xtant X604 x 2
Xtant X1001 x 1
VST 7" LCD x 2