I am in the proccess of purchasing an AV Receiver and 5.1 surrounds. Of the electronics that I've heard so far, I really like the Marantz line, specifically the SR7400. The speakers I'm looking at are the M&K 850's with the 850 center, 650 surrounds and either the 850 or 1250 sub. I have 2 questions....First, I really don't need the 7.1 capabilities of the SR7400, I'll have a difficult enough time squeezing in the 5 speakers into my room, so would I be better off with possibly a SR7300cse? Are there sonic differences between the two? Also after reading various forum entries, I'm concerned about the SR7400s ability to drive the 850s(4 ohm speakers). Does anyone currently have this combo? Thanks.