I am looking at getting teh epic 60 home theater system, but adding the larger center channel the VP 150...I am debating switching out the EP 350 for the EP 500...is this overkill? Cost is a factor. is there going to be a huge difference in sound and range to justify the larger sub or will I be fine with the EP 350? My main goal is for there to be no distortion on the lower end of the range during movies...