what he said

IMO your better off upgradeing the engine first before looking towards mappable ECUs, its alot of money for very little gain on a standard engine (is yours standard spec?) and the standard igniton stuff can cope pretty well with reasonable modification, its when you have really wild mods that you'll find problems

Get a stage 3 spec head on there with a good cam (something like a Kent cvh27) and a Janspeed system with the tubular manifold, maybe even some nitrous then look towards adjustable ignition