Thxs for the reply. I assume you've seen the insides and also tried it.
To drive the Omegas I'd get the 717, it's my first affordable and safe option. I lived for some time with the 404/006t combo, and wasn't very pleased. I didn't like the 3030 system, but for different reasons. I suppose the OII/717 should be a different animal.
I've had a look inside my RPX-100. Not a technician myself, so I cannot judge the circuit and its implementation. IMHO build quality ain't that bad, maybe it could use more boutique parts for the price, but there aren't crappy ones either but for the phones outputs.
Sound-wise it's quite OK, it can drive any phones I plug in and doesn't exhibit easily noticeable flaws. In fact it has some sort of musical flow preservation that I like. Of course I think it's overpriced, but most hifi stuff with some pretentiousness is. Nontheless I'm glad I got it used, had I paid full price maybe I'd be a bit disappointed. After all building a power amp to deliver 1w, 2w @ 30R keeping the signal path clean and simple shouldn't be that difficult nor that expensive.
Rgrds