Step up From Rogue RP-5

Hello, first time poster here. 
My system currently consists of Rogue Audio RP-5, Rogue MP-180 Monoblocks, denafrips Venus II DAC with Focal Sopra n2 speakers. That upgrade itch is there :)  I’m curious about the ARC LS28SE  also its big brother the 6SE in comparison. I like the price of the LS28SE more of course, but wonder what you give up from the 6SE. 
Love to hear your thoughts. 
Cheers!