Polk LSi9...good integrated amp to drive these???

Check out Cayin. Fantastic build quality and sound to match. One of the biggest bargains in audio.

Get a Dynalab receiver.

The reviews I've been reading on these speakers are basically saying that since the speakers weigh in at 4 ohms, you need a good bit of power for bi-amping. I've never bi-amped before, so I'm counting on you pros to help me select an integrated amp that will run these guys at full-speed....

I used a Classe Cap-151 with my LSi-15s with good results. But there are so many decent amps to chose from; afraid you're going to jump in and try a few.

The DK Design or Krell 400XI would push those well also. The DK has a little more control over a tougher load even though the krell has a higher wattage rating. Both of those amps used are in your price range.