Your question needs a bit of clarification. What are your chosen speakers ? musical tastes ? You say you want more "oomph" than the 3.1/28 combo provides. My suggestion would be to try the 3.1/BC26 as Sugarbrie suggests, or perhaps your 3.1 with a pair of BC8's (they've got MOJO !, yeah Baby !)
My absolute favourite pairing of BC products is the AG3000/AG8000. My own personal pairing is the AG3000 with a pair of BC8's (soon to be upgraded).
Since your digital front end does balanced, I would suggest you make the move to either the BC9, or the AG3000 (ultimate choice here), and then run balanced into either a pair of BC8's, or a single BC26. You'll not just get more "oomph", you'll get a higher overall level of performance.
Pending knowing more about your speakers, etc. that's about all I can offer.