You might want to watch out for Mr. Dicks' recommended boxes.  I had a couple guys post me from my site who had put the Fostex 206 in his load and were wondering what they might have done wrong, since they were not experiencing the thunderous bass he had described.  I think it very unlikely that you will get Big Bass from an eight with a Qt of 0.19 in a vented box; you can run the sims in WinISD yourself.  This looks like a horn driver to me.  The six looks like an overall better driver for a VB or TL, even with its higher Fs.

2¢,

Poinz