the AVC-R allows gear based boost settings, I don't think the PowerFC add on EBC lets you do this?
If you're after replacement ECU, have you thought about the Wolf3D v4? The 200SX list has a few guys using it.
I think it too is a swap-in, swap-out ECU with just one or two sensors needing to be installed??? (Sorry to be vague, but that's all I have heard about it).