The HKS FCON V PRO is the top one mate. It allows better mapping due to the greater resolution, and has additional features such as the ability to raise the rev limiter etc.
It will also have the HKS MAP sensor fitted to it and do away with the OEM one.
Basicly when the internals are done, there will be no need for any other engine management system.
What HKS say::
The HKS F-CON V Pro is a fully featured standalone engine management system that connects as easily as a "piggy-back" fuel and timing controller. As modifications to a vehicle are made, the need for fuel and timing adjustments becomes critical for performance and safety. The F-CON V Pro with its 32x32 resolution for both fuel and timing maps is the optimal solution. The F-CON V Pro can control up to eight injectors and D Jetro or L Jetro setups. --- Injectors can be set to fire as batch, sequentially or staged. The F-CON V Pro can also read drive by wire vehicles. Programming is done via the HKS Power Writer software; which only Certified HKS Pro Dealers have access to. The HKS Power Writer software for the F-CON V Pro has some very unique abilities to simplify setup and tuning. Via the vehicle start up menus most Japanese import cars can be easily started by selecting the vehicle’s parameters (Make, Model, Engine and etc). Tuning is simplified due to the A/F Feedback control; where a target A/F value can be input and the F-CON V Pro will adjust fuel automatically. Also full data logging capabilities are built into the F-Con V Pro Power Writer software. All major vehicle conditions including; speed, rpm, water temperature, intake temperature, timing, boost, injector duty cycle and etc can be logged to an HKS Pro Dealer’s computer.