I've had the Stello DA100 Signature in my system the past couple months -- it does not sound thin and the soundstage is remarkable. In fact, it makes my EVS Millennium DAC 1 sound flat and 2D by comparison. The best way I can describe it is that the DA100 not only presents a layered soundstage, it does so in such a natural and realistic fashion that you don't just see/hear the layers -- you can actually sense them as well. Had the same experience with a Stello DP200 a while back, so it seems to be a family trait.
I found this review comparing the Stello DA220 with the Benchmark if you haven't seen it: http://www.soundstage.com/revequip/benchmark_dac1.htm.
I think both units have been upgraded since this review, but the core strengths probably remain. They both seem to come very close to the best available, so it's hard to see going wrong with either sonically speaking. So, to answer your original question it seems there are DACs in the $1000 range that are not thin sounding and do soundstage like champs. Hope this helps.
I found this review comparing the Stello DA220 with the Benchmark if you haven't seen it: http://www.soundstage.com/revequip/benchmark_dac1.htm.
I think both units have been upgraded since this review, but the core strengths probably remain. They both seem to come very close to the best available, so it's hard to see going wrong with either sonically speaking. So, to answer your original question it seems there are DACs in the $1000 range that are not thin sounding and do soundstage like champs. Hope this helps.