Hi Neil,
Given big price difference (in terms of brand new purchase, Ymer + Saga combo should costs approx. as one single block Evo-600), I'd say Bladelius may be the smarter choice... assuming you're not a cost-no-object boat saylor...
It depends on speakers and room size as well. BTW, Krell Evos will demand appropriate level of preamp, which would likely rise the price difference up to 3:1. Too much...
BTW, it also depends on your destination. For Europian buyers nowadays (weak euro, at 1,21 or so), Krell is even more costly. In USA, things may look better for Krell option.