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You can go plenty fast with just an AFC. But if you want more data to look at then get the ECU+, I have only briefly looked at it though. A basic AFC and datalogger will take you a long way on a 1G though. If you really want a lot more then you might want to look into a an AEM EMS.
I have done a few Greddy E-Manages and they are a nice system, especially on cars that don't have a factory ECU as forgiving and easy to work with as the 1G DSM ECU. You don't need to use all the sensors with the E-Manage. If you just get the basic unit and support tool software, then it will be like a fancy AFC on a laptop where you can add or subract fuel based on RPM and throttle position.
If you get the ignition harness you can add or subtract timing from whatever the stock ECU wants to run based on RPM vs Karman HZ or boost pressure, if you have the optional map sensor hooked up.
If you have the injector harness, you can directly add fuel to the injectors without the stock ECU knowing about it on an RPM vs Karman HZ or boost pressure map. You cannot subtract fuel with the additional injection harness. That harness is most useful on cars that aren't getting enough fuel under boost, but you don't want to try to add fuel the normal AFC way. It isn't the most useful harness on a DSM, because the stock ECU usually makes us run too rich. It could be helpful, if your injectors are too small for your current setup and you need to add fuel, but your running into fuel cut. This harness is very helpful on cars like Hondas that go into limp mode if you try to add fuel on an AFC.
You can do datalogging and map tracing in the software, but it will only tell you what changes you are making. Like if your datalogging timing, it will only tell the amount that you are changing it in the E-mange not the true overall timing.
It has some other stuff like an anti-stall feature to combat stalling problems and a MAF/MAP clamp feature that can be used in conjuction with the additional injection harness to fight fuel cut or the ECU seeing boost on pressure based systems. We use it on Neon SRT-4s to keep the ECU from seeing over ~15psi of boost because above that the stock ECU starts pulling out way too much timing.
If you have any othewr questions about the E-manage, let me know. I dunno if I would run it on a 1G DSM. I would rather use a chipped EPROM ECU and make any timing or large injector correction in it.
BTW, the 1G DSMLink is in testing now and might cost less than the 2G.
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