I agree with Gene, and would go with the Onkyo 876. I have the Onkyo 805, and run LSi9 mains and an LSiC center just fine. When setting up the Onkyo for the first time, there's an option to set it for 4 ohm speakers. Use that setting, since LSi speakers are 4 ohm. One big consideration with the Onkyo..........don't close it in, in an entertainment center. Use it on a stand or top of a rack, so it can breathe. As long as it can get some air circulation, the heat problems you'll hear about, isn't a problem. It hasn't been with me anyway.
The Audyssey is wonderful. You can make changes after running it, if you need to. It tends to set speakers to Full Band (same as Large on other receivers), so I changed that when it finished, because I use a subwoofer. The other settings that Audyssey made were spot on. I didn't have to change another thing.
I had a Yamaha HTR-5940 (I think that was the model number) 6.1 receiver, before my Onkyo. I think the Onkyo is much easier to use. The Yamaha I had didn't have OSD, so doing the setup, or making changes to settings was more trouble, because of having to see everything in the receiver's small display window. I didn't like that at all! I also didn't like the amber color of the receiver's display, but I hear the new ones don't use the amber now. Once setup, the Yamaha was very nice. It sounded good, and I never had any problems with it. I had it about a year. I sold it to my wife's brother-in-law, and he likes it a lot.
I also like Denon receivers, but despise their remotes. A Denon, with the same features as the Onkyo or Yamaha, will cost a good bit more. My experience with my Onkyo tells me the Denon isn't worth the price difference.
Good luck with whatever you decide on.
BTW.............
If you get a receiver that doesn't have the option to setup for 4 ohm, make sure it has pre-outs, in case you end up having to add an external amp, to drive the LSi's.........
Using 4 ohm speakers with an 8 ohm receiver, can cause it to run hot, and go into protect mode & shut down. Especially if you like to listen at loud volumes. That's why people suggest using an external amp, to take the load off the receiver.