My 9515 or someone else's? I sent you a PM recently and you never got back to me.
Lawl, as far as an amp @ 0.5 ohm, there are an abundance of IA 20.1s available. I had one on a DD 9917 QVC2 (@ 0.5 ohm) and it was nice and loud. Get one for $350 shipped and you'll be set with that and a 9515 for a set-up that will do at least 140s.
There is one in the classifieds right now listed in the title for $360 shipped, he offered me $350 shipped. There are several others that have been there for a while at $400 shipped. You could probably get them down a little bit.