Mirage speaker setup?

Hello,

I'm new to Audiogon and am very pleased to have found such a great resource! I'm hoping to get some advice/suggestions on a purchase I am considering. We are moving from a smaller home to a larger one where I will have enough space to invest in an upgraded sound system. Currently, we listen to most of our music from a pair of small bookshelf NHT speakers. For movies, we have an Onkyo home theatre in a box setup with the receiver being a tx-sr606. Anyway, I work with a colleague who is moving and wants to sell his Mirage speakers: a pair of M5si's, M7si's and an MCsi center channel. I've listened to his setup and thought it sounded great, but I am a novice in terms of audio equipment. I understand that these speakers are from the early nineties and quite old, but are of good quality. My questions are: Would this be a good purchase for listening to 70%music and 30% movies? Would my receiver (onkyo tx-606) be able to handle these? Are there other factors I should consider? Finally, what would be a fair price for these speakers being in good condition but older? I really appreciate any advice/suggestions on this, so thanks in advance for any replies:)