Theta v.s. Sim Audio

I have the Magnepan home theatre setup consisting of 3.6 mains, MGCC2 center, and MMG12 rears, and 2 Velodyne HGS-12 subs. I am considering the Theta Cassablanca/Dreadnaught which I've auditioned or the Sim Audio Attraction/Stellar/Titan. Has anyone heard both of these setups? I've yet to hear any HT amp more musical than the Theta but with all of the favorable reviews of the Sim Audio HT products I simply cannot ignore it. Thanks.

I cannot afford nor am I interested in Meridian or anything in that price range.