I'm new to Home Theater arena and am looking to setup my first HT in next couple weeks (budget around $500). Both Yamaha HTR5550 and Onkyo TX-SR500 seem to have same features. How do they compare in quality ? Does anybody have a setup of either of these with Polk Audio RM6000 or JBL NSP1 ? Is that good enough for a small (18x12 ft) room ? Thanks for your response.