long story short I'm plannning on a high-revving engine (10k+) I've been reading about clutchs and flywheels and alot of people revving past 10k are talking about fully matched and balanced flywheel/clutch combos. Is this really a big thing or will a high quality pair be fine?

 

When balancing you should balance all rotating parts from the pulley to the pressure plate.

Hopes this helps.