Have $1500US , an Onkyo 801, want 5.1 speakers

[giantfan]

I have a bugdet of $1500 for a 5.1 set of speakers.

My family room is moderate in size 2,300 cubic feet, rectangle open on one long side for the staircase that area adds another 700 cu.ft.

Any suggestions on what to mate with my Onkyo TX-NR801. My CSW Ensemble III's that I used in college just wont do.

Thanks