I have a sony STR DN1080 receiver, two old but still very nice Mirage OM14 floor soeajers, A KlipschSPL 120 powered sub, and Klipsch surrounds and front. I mostly play LPs and watch movies. But music most important. A Fluance RT85 turntable with an Ortofon Blue stylus and a Schiit Mani preamp. I guess my question is..would this system perform better with a separate amp? If so, suggestions under $400?