Time for an upgrade.

I'm using a MA silver centre that I got off ebay to test out the surround sound concept. The rest of the system is an odd assembly of Reiver Edingdales and Dali wall mounted rears. I'm looking at the Dali Opticon Vokal (£460) vs Martin Logan Motion M30 (normally £690 but as it's an older model they are selling them off for £350). Any thoughts or recommendations?