FooFighter
Headphoneus Supremus
Yes, I tried VLC too.Installed Mconnect on a friend of mine's iphone once, worked fine. You can browse upnp or network libraries, and output it to any upnp renderer (like Neutron - very nice features, worst interface ever). Mconnect also have a local player.
Oh, and I'm very, very attached to my personal library
EDIT : Note that mconnect is far away to offer the same experience as Bubble upnp. Mainly, you don't get the upnp library search function (for libraries which support it, like Foobar2000 upnp library). As far as I know, Bubbleupnp is the only phone app which supports search function on upnp libraries. I'm interrested if someone knows about another one tough. Maybe time to switch to android ?
For videos, VLC supports upnp and network browsing on android, I assume it's the same on IOS.
Though I remember I had hick up issues playing hires files with Paw S1, will need to retest with W2.