The Alpine is good SQ - how much are you getting it for?
Unless you get a REAL good discount, the MBQ and Polks are not VFM. No A.S.S. to speak of. Not sure of the MBQ, but the Polks are definitely bright. Hertz DSx would fit in your budget and is good, but again, no A.S.S. and no way to audition. Infinity is less bright as compared to JBL, but is slightly costlier. Blau advantage is terrific A.S.S. and moderate prices for the sound.
6.5" will fit in the stock location, just needs a bit of filing based on the frame of the speaker to be mounted, which the showroom guys will be able to do.
The Blau GTt1200 is a good bass tube; alternately look at the JBL tube. You could perhaps pay a visit to the JBL brand shop if you want to check out the JBL tube, more so if you want to audition the Infinity components (6020c).
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