I used Unison Unico SE integrated with my 2 Sigs, and it was a great, enjoyable match. Unison replaced the SE version with Unico Secondo, which has less power, but better build quality.
I tried also Luxman L505u with good results, but not as good as Unison for my taste.
I tried also Luxman L505u with good results, but not as good as Unison for my taste.