I was also looking at the yamaha yep 2200 and 3300 a couple of weeks ago and one of the stores had the yep 2200 without a sub, and it was a small room but i don't know what it was i was not impressed at all, especially for the money.
I then looked at the bose 1st, I am not a bose person but still wanted to see why it was getting great reviews. I though it sounded better than the YSP2200, i could literally feel the sound on the sides and behind in the demo dvd that was being played.
although i side of the wall was not there so i could not hear from that side.
I also read about the Vizio with wireless rear speakers that has to be attached to the sub. I went with that and so far i have listened to music only and it sounds good for the price i paid and it gets loud. Is the sound great thats subjective, for a casual users it will be plenty good.
I am sure the surrounds will be even better for movies. for under $300 you get a lot of settings that you can change with the remote and you get bluetooth connectivity, for the YSP you have to buy a separate dongle which need sot be attached to the iOS or android device.
I have read that vizio will be coming out with a larger 54" model in nov,s o if you can wait you should get that, also I listen to the one that i bough in store and it was alright as it was not properly setup, but it was so completely different setting it up at home.