For that budget, ditto on the SVS pb100 (500.00) and Affordable Accuracy LRC speakers from Philharmonic Audio; I'd go with the towers due to your room size (375.00, including the center). Then for the receiver I would look at the Denon AVR X2100, which is on sale at Crutchfield for 400.00 (reg 700.00). (I own an older Denon AVR 1912 and am very happy with the unit). Now you're at 1275.00 and you have some $$ remaining for speaker cables, interconnects, HDMI cables, etc. BTW, Dennis Murphy (i.e., Philharmonic Audio) is highly skilled at voicing his speakers for a balanced, open and accurate sound. I own a pair of his Philharmonitors and love them. Good luck!
Afterthought: You also might want to look at the Sony STR DN 1040, which was an audioholics.com choice for a budget receiver for 2014.