Best ABY Box and Volume/Aux Pedals?

Hey guys, I just recently invested in a TC Electronics G-System and I'm trying to figure out what else I would do in terms of my pedal board setup.

Currently I have a Music Man John Petrucci model guitar with a Piezo. I would like to utilize both of my guitar input jacks with my G-system and I see that the G-system only has one input. The thing I can think of in terms of having an option or a blend between the guitar pickups and the piezo is an ABY box.

Do you guys have any suggestions for the BEST ABY box that I could purchase? If you have a better solution besides an ABY box, please let me know.

Also, I will need a volume/auxilary pedal for the G-system as well. Another situation of "what is the best."

Thanks!