I replaced my failing Delta-66/Omni a while back. Replaced with a Tascam US-16x08 - great interface!
Variety of input types, multiple outs (assignable), DSP mixer, 8.7ms RTL at 48K/64 samples.
Solid with Reaper x64 and other audio apps in Win8.1x64 environment. This thing rocks! and includes MIDI I/O
Street price: $299
http://tascam.com/product/us-16x08/