It depends on what your intentions are for the future. If your happy, leave it, if you intend modding the motor then an aftermarket ecu is essential. Pfc's aren't the only game in town [motec, wolf, haltek etc]. But they are probably the most familiar.
Looking at the mods you have at the moment, I'd probably be doing a few other things to take advantage of a good pfc = fuel pump, injectors, turbo upgrade, boost controller etc and I've probably missed a couple of things. You need a pfc to be able to use these mods, you need these mods to get the use out of a pfc.