Want to buy JBL

Please help me to choose and give me suggestions

50% movie 50% pop song

(JBL E30 / L830) + LC1 + (Denon AVR 2807 / Harman 635)

I don't want to buy JBL subwoofer, any other band matchs JBL speakers. Budget under $4000.

Is it a big different between E30 and L830?

Any better choose than LC1 for the center?