The Solobaric on Ebay is around $275 Shipped, and can push 750RMS.
I believe the Alpines can push about 400RMS each. I am looking at around $150 shipped for both of these on ebay.
Since they both push about the same RMS, which one in your opinions will give me more 'bang" or "boom" for the buck.
Space is not a concern either.