First off - you do know you will need a phono pre if you want to use that Thorens with the Rag, right? See the appropriate page on the Schiit site.
I use Rag with 90db-efficient towers and a sub (via RCA outs) with great satisfaction. Be aware that this amp has real balls all by itself; don't be surprised if you're tempted to adjust the sub
down. But this is not a "warm" amp - it adds no mid-bass sweetening. Which may or may not be an issue depending on your speakers and your taste.
And I think, when comparing Rag to any simple speaker amp, that you will be impressed by the Schiits way with a soundstage - each event given its own space, everything presented for your inspection with nothing hidden. I'd be amazed if you didn't say to yourself, often, "I never heard
that before," perhaps even more with speakers than with cans.