I find it interesting on the forums here when there are multiple threads running discussing almost equivalent things (or nearly the same things).
In this thread:
http://www.thorforums.com/forums/f8/...sue-13024.html we have someone who has just completed what you want to do. In their case they installed the inverter after the converter/breaker panel off the breaker that goes to all the outlets.
I would think that this is more in line with what you want to do. It is fairly simple in that it only involves 1 line (all the non-GFI outlets).
The advantage here: All the high current A/C appliances are not on the inverter and thus you wouldn't have to worry about overloading it via them (A/C, water heater, etc.).
If you think about it: it really doesn't matter if you're installing before or after the breaker panel (I'm speaking physically here) because the inverter will be installed in the same spot--its just where/how you run the wires.