I've been using Beyer M160s on soloists for a bit now. Their directional pattern is very helpful and they're not too huge. When that is a little too tight, I'll reach for the M130 or the Royer 121.
They all work well on female vocals (particularly soprano) as well as string instruments, trumpets and bones. For male vocalists, horn, clarinet and flute soloists, I'll generally use Schoeps CMC6 MK 4. I've used the DPA 4061 on a number of occassions but couldn't get a sound that I liked in most situations and wound up selling it. Besides, you should see the look of terror on most violinists' faces when you tell them you want to put a mic ON their instrument.
Re: the Avant Electronics-
I've used their shockmount systems for some time now with positive results.
However, I have not tried their mics. They make no bones about telling you that they are Chinese manufactured (which, IMO, makes them better than those who claim to be made in the US but really just re-inspected Chinese stuff). A colleague of mine in the area recently indicated he was going to purchase one. If he does, I'll try it and let you know.
In all honesty, I'd be hesitant to use them on anything of any critical nature, but that's purely speculation.