That sounds great Dave. I've been carrying external e.q. and external harmonizer.
I may continue to carry a Mackie 1202 in order to use more than one mic through the keyboard effects and harmonizer. That way I can use phantom power and XLR inputs and run a send to the X1.
However for small jobs, just a mic and the X1, and maybe a powered Eon or two is all you need.
The X1 mic input is 1/4-inch, but it will accept two mics by using a y-type adapter. Only one mic will go through the harmonizer though.
That's why I use the small mixer. It also lets me run back out of the X1 into the mixer and use balanced XLR outs to the Powered Eon speakers. And I connect a minidisc recorder so I can later listen to all the mistakes I make.