Ok, let's do some side by side comparison of the receivers and the speakers. The Onkyo 707 is 100w/ch, THX Ultra 2 Certified, Audyssey EQ and has DACs just in case you want to upgrade to an outboard amp in the future. The Denon is 75w/ch, no thx certification, no Audyssey (but it does have a room correcting eq), no DACs, but it is hdmi 1.4 compatible. Personally I wouldn't let that be a deal breaker being that we don't know yet how the 3d thing is going to pan out long term. That being said, the Infinities have a response from 38-20k, 8 ohms, have 2 6.5 woofers, a 4" mid and a 3/4 inch tweet and are able to handle up to 200 watts. They are also quite a bit more expensive than the 2030s. The Behringers have a 6 3/4 woofer and a 3/4 tweet and can handle 100 watts, with a response of 75-21k. If you are using a sub, I wouldn't worry too much about how low these things can go because you dont need too much overlap between your mains and the sub anyway. If your budget is 1000, you might even still have enough $ to buy a nice pre-built sub or a pro amp and diy sub.