I don't think either of you guys really have a sense of what it means to run a chipped ECU. Forgive me if i'm wrong here.
Just because it's "chipped" doesn't mean its a total one off custom set up. I've done many chipped ECU's with stock base maps meaning a P06 or P28's for example loaded with a Pxxx base map (chipped). The reason I and may other do this is because the P06 for example is dirt cheap. Then you load up the chip with the map/extras you want and slip it in the socket (typically) of the ECU you're building which is cheaper than the stock ECU would have been (like a P72 for example). Yes, you can also run a custom tuned chip specific to your application, but simply asking/saying "which chip is best" or "no need to chip" isn't exactly spot on.
IMO, a cheap Pxxx ECU "chipped" with a base map to get you started is better than paying for the OEM ECU because you're already one step ahead of the game if you ever need a custom tune and have paid less money up front... That's what I would do anyway....