Parts keep going up... the bike makers aren't making much on bikes anymore, so they have to recover elsewhere. You could try service honda (a board sponsor). They have always had fair prices.
For the plating, the rule of thumb (ha ha) I have always heard was that if you can feel something in the cylinder with your fingernail, it needs re bored.
I think the factory plating actually goes pretty deep. When I was talking to Eric Gorr about replating my shot 200 cylinder, he recommended going to the 220 even if I didn't want more power, as removing more material helps ensure the original factory tungsten disposition coating won't interfere with his Nicisil coating.