I've only got about 50 hours on my Sig 30 so far, but I'd definitely predict that you'll find the Sig 70's worth the wait. My Bastanis are uber efficient, 100dB/W/m or so, and the clari-t drove them far louder than I'd ever need to listen so I didn't think the extra power would make a big difference... not so. The 30 grabs hold of my speakers and controls them like nobody's business, in a way that only megabuck SS amps are supposed to be capable of. At the same time it does texture, delicacy and finess like I thought only tubes could manage. I now completely understand why Srajan said there's no need for a tube pre to color the sound, this thing works magic all by itself and stands on its own as a serious high-end contender.
Gary