For HT only, you should add the consideration of the a7-350 or the updated a7-450 (which should become available soon). Both should at least match pb13 output, with a noticable advantage I would think, in case of the a7-450 with a beefier than 19ov.2 , conquest-like driver and 1300w amp. You can get them in a nice matte black finish for a small upcharge, with free shipping a7-350 will be 30% cheaper than ultra and the a7-450 will be about the same. The support is great, at least for people in the continental US.
Another alternative would be the a7s-450 or pair of them. Said to be similar to pb13 by an owner of both, in SQ and output, is currently offered in a free matte finish and with a free EQ. A pair of all of the above would cost you about $1700 shipped and would have output close to that of a7-900 iirc from what eD rep told me.
Apart from that I'd recommend the Castle at $1k but I'm not sure what's going on with Epik right now.
I'd personally choose any of the above over svs but of course you have to factor in that the only competition they have is themselves, according to themselves.