Alternativley you can go Autronics or motec which are also expensive but money is very well spent. The only thing that has me about verso is, whilst its a solid reflash (kudos Pete :P) that if one day something does happen to Sean, Nic and Pete (hopfully not though haha), where does that leave everyone with the tune?
My fuel economy from having a PowerFC put in stayed about the same. 450-470kms per tank after mild mods. Like RichX said, the foot makes the difference
There are heaps of things avaliable, just do your research and ask questions, and you should be fine. Welcome to the forums and enjoy your stay.