I have the UUC 11.5# flywheel and love it. It chatters alot when the A/C is on and a tiny bit when it is off, but I don't care. Engine revs so smooth.
Speaking of which, I think you can use the M40 single mass stuff for an easy swap too.
pelican has a single mass flywheel for our car, for without ac,the European version they have this in stock.