I got one recently.
Re the head, you won't have much choice buying an older car.
There's info on here somewhere, but basically A apparently almost always fail, B sometimes and C never.
But they didn't start fitting B and C till much later on.
So unless you find one which has already had a replacement, it will be A.
Take off the engine cover, look at front right, by the metal pipes, number is backwards in the head casting itself.
Re clutches and flywheels. It's not un common to replace a dual mass flywheel along with the clutch. But only if needed. Genuine ones can last a long time, depends how it's been driven. I've seen clutches last a few k, to 150k plus.