I would resurface the flywheel that you have, which is your least expensive option ($25 to $50.00).
I found you have to have a heightened level of skill to use the lightweight flywheels. In the morning, and when you are inattentive or tired, you can expect to stall the car when taking off. And usually at the most embarrassing times.
The car is more lively and responsive with the light wheel, but to me it was not worth giving up that no problem launch on a daily use car.
Good luck with your project, get lots of help from your family and friends and double check everything, and oh, it has been reported that sometimes people install the clutch disc backwards, leading to all kinds of issues and another tear apart. It is well marked but things happen when you are working around midnight.
I suggest you take lots of pictures before the work commences and during every stage of disassembly.
It may help to determine if you will need an engine support mechanism at the time that you lower your subframe. Many people have accomplished it without one, but if you decide to use one, Nick Chrimes has a good write up to make one.
If you lower the sub frame and engine too much at the back, you can damage the DIS unit on the front cross over intake pipe when it contacts the strut tower, so have a spotter watch for that.
http://www.wikisho.com/wiki/Engine_Support_Beam