Not to insult your choices, but I've never found Sony to make good audio equipment (save for my headphones
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). If you can find a good dealer, see if you can take in your mains and your receiver to do an A/B comparison. To do this right, however, you should use an SPL meter to level match. If you don't, the comparison will be unfair. An awesome dealer would let you borrow a receiver and try it out at home.
Seriously though, I think you should consider the Phase Tech PC-Series (particularly the PC9.1 speakers). Just be warned that they are 4-ohm speakers, so you'll need a separate amp or beefy receiver to drive them.