If by "wow" you mean stuff like TrueHD from Blu-Ray, get the 6100 and set it for 5.1.
7.1 setups can do 5.1 with a simple adjustment in the audio menu. You can eBay or Craigslist the extra speakers, or use them as a second zone. Most of the "wow" factor systems from Onkyo and such will be 7.1.
Otherwise, the 4100 will do all right with Dolby Digital 5.1 and DTS 5.1. You can also get an Onkyo TX-SR606 standalone receiver and a good 5.1 speaker package. Might be a tad more than the 6100, but it would also have plenty of sound quality while staying 5.1.
Thanks for the reply. Yes I will want the TrueHD. I may just get the 6100. I have a decent Boston Acoustic center and bookshelves but by the time I buy a receiver, fronts, and a sub I possibly will have more than just getting the 6100 and running it 5.1.
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