The R90 is rear port and the R180 is front port. If I am going to be hanging them on the wall, would the front firing R180 be a better choice for the 3 fronts.

<a href="http://www.monitoraudiousa.com/product.php?range=4&product=25">Monitor Audio R90</a>


<a href="http://www.monitoraudiousa.com/product.php?range=4&product=26">Monitor Audio R180</a>

Explained by MA.
I've only heard the 180 as a center channel, so I'm going to do a cop-out here and leave you with the people who know them best.<ul><li><a href="http://www.monitoraudio.co.uk/product.php?product=26&amp;range=2">clink</a></li></ul>

the rear or r90's for the rear.

OR upgrade your left and right for the 2225's and stick your 180's in the rear ;)