When it comes to flywheels, there never is a "too light"...or at least when given the options on the market. I would go Fidanza or ACT, whichever you can get a better deal on. Theyre cheap, well designed, well constructed and at ~7lbs are about as light as they get, aside from Comptech, which is more $.

You'll get used to whatever flywheel you get. Any issues relating to stalling will be identified and corrected within 15 minutes of driving the car. It will drive differently...rev faster, therefore you have to engage it a bit different. There are no intermittent stalling issues or anything, you just have to get used to it.