A 300x5 (forget 7 channels) will weigh 110lbs+. Do you really want something that heavy (+ think about the power requirement).
Perhaps, a better alternative is a more powerful version of the mono blocks... a Model 2400 anyone?????
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BSMNT HT - Oppo DV-970HD,Tos HD-A2,Emo LMC-1/Onkyo TX-SR705, Outlaw 7125,PSB Image 4T 8C 10S, Outlaw LFM-1+,Panny PT-AE900U, DIY 106" fixed screen
LIVRM 2ch - Philips 963SA,Lexicon DC-1,Carver AV-505,Von Schweikert VR-2,Sony KDF-E42A10