I like the faderport too. I plan to to replace my interface, so to me, for the money I'm looking at the Studiolive mixers. My main rationale being the price for a stand alone interface with lots of channels is about the same as the 16.0.2 which has a built in firewire interface. The series three is more expensive, but you get 100mm motorized faders, great preamps and onboard efx. For anyone taking on recording jobs this is a sweet setup. With the series three if you use the built in effects in the mixer SO3 will treat it like a vst in the daw. Making a change to the mixer compressors or fat channel makes that adjustment in SO3. I don't use a patch bay, so for me, it's nice to have the I/O inputs readily there so I can simply plug in my gear and use it much like an analog mixer.
The series three can also record without a computer if necessary. Too many other things to really cover here.
I'm going to wait until I finish my other recording space and then I'll likely be buying one of the Studio live mixer/interfaces. which will serve as my studio hub. If you record in a studio and play out live, this is hard to beat.
The Behringer X 32 is a great mixer too and you can use it with SO3, but it doesn't mesh easily into it like their mixers do.
Presonus also has some cool monitor control gear.