The 301's should be your front mains and the 161's your surrounds.  Assuming a 5.1 system, the surrounds should be on the side walls.  See how it goes without the Bose center channel.   That speaker never impressed me.   But, if you feel you need a center channel, That would PROBABLY be the best match for the rest of your Bose system.
As for suggestions, that depends on what you mean by "new options".  A lot of receivers have so many bells and whistles that it pays to know what you actually need.  you could wind up paying a lot for stuff you might never use.
But, for shopping, I recommend this place.  ...assuming you don't mind high quality, factory guaranteed refubs. Many of us have used them very successfully.
http://www.accessories4less.com/
FWIW, I'm running a Denon 2802 I bought as a "last years model" special in 2002 so my opinion may be a bit biased.  You should also consider Marantz and Yamaha as well.
Oh, Rich?  Bite me! 
