IMHO, don't spend the money on going from 5.1 to 7.1 (having both)... Spend the money on the decoding you want. JMHO.

LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7