I would do 2 pairs of Ascend CBM-170SE ($600 total)
1 CMT-340SE center ($300)
Rythmik LV12R ($600)
You'll be $200 over budget with your low-end receiver, but you will never need to replace those speakers when you upgrade your receiver.
1 CMT-340SE center ($300)
Rythmik LV12R ($600)
You'll be $200 over budget with your low-end receiver, but you will never need to replace those speakers when you upgrade your receiver.