Given that room treatments are not a possibility, I'd be looking at the S3.4's or C1's with a subwoofer.
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I have owned a pair of 5.4's for about three years now, and still love them. My system has improved so much since acquiring them, they just kept sounding better and better as the system grew around them. I first heard the 3.4's, and thought they were the smoothest sweetest speakers I'd ever heard. You can't go wrong with either one. I drive my 5.4's with 300wpc, but recently I had to drive them with 100 watts, as my 2ch. amp was being upgraded. I was surprised at how good they sounded with the smaller amp, so I think you would be happy with your current amp.
You can get by with a little less spacing between the two, and still get good results. You can try the foam plugs in the vent for closer spacing to the walls, if need be.
If you get 'em, you're going to love 'em!
Thanks much for your input. Still unsure on whether to ramp up to the 5.4s or stay with the 3.4s. If wife can deal with the new "gateway" into the living room, I'll probably make a run at the 5.4s. The porting issue is especially helpful to contain room resonances. Thanks again and have a great Christmas.