A full Marty (in the corner) with 2 VBSS behind the couch is my exact setup. It's great. I've never had horns to compare them to though.
If you can, you should look into adding a BOSS platform for your couch too. I just added mine this past week and it adds a whole new level of enjoyment. If you only get 1 amp you may not have a spare channel is the only downside. I have a 3000dsp and 6000dsp so had open channels to use.
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Equipment: Yamaha 3050, Oppo 103d, DIYSG HT12s (L,C,R), PSA mt 110s (SR,SL), 2 VBSS, Submaximus, 4 driver BOSS build, umik-1, Epson 3700