not a bad choice...... since i owned the coaxial version of the alpines (the spg-17c2) and they were possibly the best sounding coaxials*. very neutral sounding speakers and the midbass was amazing. im sure the component set wont disappoint either.
however as to why u chose them, let us know what how u felt when u compared them to the infinities (what model)?
*in comparison to alot of other coaxials i tested that were available here. the spg-17c2's were sourced from abroad.