RME Fireface UFX II by hello people
I upgraded to the Fireface UFX II after using the RME Fireface UC for 7 or so years. The UC never missed a beat, as they say, and performed flawlessly with every use.
The Fireface UFX II offers way more i/o, 2 headphone outs, Totalmix FX and many other features such as non-DAW straight to USB recording.
It's built like a tank, the preamps sound good (though I won't really be using them since I connect a UA LA610 mk ii and a Grace m101 as preamps), latency is great and in operation, like the RME Fireface UC, it works without issue.
RME is renowned for great quality, clean ADDA, solid preamps and reliability.
It cost a few pennies, but if it works like the UC did, year after year, it'll be well worth it.
If you're lucky enough to be able to afford it, get it.