@Rensek just curious, would you sell your Saga/Vidar combo if you bought a Rag 2?
Given that you have very efficient speakers, I think it makes perfect sense to question if a Ragnarok would be a better solution for you since you also use headphones.
That being said... you might consider an upgrade to the HD 6XX
Not that there is anything wrong with them... I own them and love them actually, and I think they sound better with higher-end amplifiers. Still though, I think generally, the transducer makes the biggest difference in the sound (not to mention the experience overall when you consider things like comfort), and if you're chasing audio quality, you can get it with better headphones in my opinion much easier than you can with a better headphone amp (assuming the amp has enough power to drive your headphones, but even a Magni 3 will do that with the vast majority of headphones).
Personally, if the Ragnarok solution was tickling my fancy, in your situation, I'd wait until there was enough in the budget for Rag 2 and a headphone upgrade at the same time (or shortly after). Or forget all that and get it anyways because it will make you happy. Personally, I think the Ragnarok 2 is gorgeous and that's worth something on its own.