I am planning to purchase 2 LSI15 fronts, an LSI M704c center and a Marantz sr5007 receiver. I'm not going to have enough money to do the rears right away. I have an older pair of Boston Acoustics HD7 bookshelf speakers I was hoping to get away with using as the rear surrounds. I know the L/R/C have to match but not sure about the surrounds. Does anyone know if these would clash with the LSI speakers or if they would be ok temporarily? Thanks in advance.