There is no way to objectively answer your question. We all want efficient speakers that sound great, and get loud. However, there's always a trade off.
The above suggestions are good ones, however, there is no way to tell which one would work best for you. Nothing is going to keep up with 2 pounding L7s.
In fact, I find it rather pointless to spend money on a high end component set when it will be so overpowered with subsonic frequencies. You're better off getting a good efficient set of mid-priced components like the CDT EF series comps (under $200.00), Focal Polyglass (around $300.00), or some mid level MB Quarts (around $200-$250.00).
I'd lean towards the Focal, because if any tweeter can overcome a couple of L7s, it's the Focal tweeter.