I've put a little more thought into things....
G-System - I think there'd be a lot of lost functionality on me. I don't really see myself using a lot of the "pre" effects, nor do I really like that I would have to digitize the front end signal should I want to use an OD pedal in one of the bypass loops. Additionally, both my amps have 8 functions, so I'd either A) have to give up some of those functions, or B) buy an Amp Gizmo, thus adding to the overall cost.
Amp Gizmo - Both my amps (Roadster and Mark V) have 8 functions, including a loop bypass. Between the Amp Gizmo, a Ground Control and Time/Mod Factor pedals I could achieve full midi functionality without giving up any features on my amp, plus the loop bypass on the amp would make having a separate switcher redundant. The only con to using the amp's loop bypass is that I loose the option to have delay spillover. This is also the cheapest option.
RG-16 - By the time I factor in the cost of adding an Amp Gizmo to the G-System, this option actually winds up in the middle in terms of price. The main advantage I see to it is that I could add a line mixer to parallel the delay and use the RG-16 to mute the input. It also gives me some room to expand in the future should I choose to add dirt or phase to the front end of the amp.
I've considered using a remote triggerable dirt pedal, which would eliminate the need for the RG-16 to bypass a pedal on the front end, but by the time you factor one of those into the cost it'd be around the same price as upgrading the Amp Gizmo to an RG-16 and using
a dirt box that I already own.... only with the RG-16 I'd have 7 more loops left over.
I guess I just talked myself into an RG-16. I could easily do what I want with the Amp Gizmo and a couple of Eventide pedals, but I'd have no room to expand without dishing out more money.
Am I on track here? Or am I missing something obvious?