Looking to buy some new speakers. Need some Help/Opinion

[Creeping Deth]

I'm looking to buy some new speakers. I already have Polk LC60i in-ceiling speakers and Polk TC265i in-wall speakers, and love the sound of both of them. So, just looking for Two floorstanding a center, and a sub. I've looked at and listened to the Polk RTi A7 and the Definitive Technology BP8B. I like how both of them sound, having a hard time deciding which ones. I think I'm leaning toward the RTi A7.

Any thoughts on the Polk RTi A7 or Definitive BP8B?

I would like to spend about $1,500 to $2,000. So if anyone has any other speakers they would like to recommend, I'll put those into thought. Whatever floorstanding speakers I get, will determine what center speaker I choose.
Also need some help on choosing a Sub.