Checking piston specs for wear

Hey guys,
When I am checking a piston after an examination break-down, what am I looking for to make sure the piston is within spec, and reusable?
Bleeds

The main reason why I would reuse it if I can, is this is that time of year where I dont get to spend very much (eat, wash, gas for car) on myself, and I am wanting to do some snow riding. LOL I have four kids, and I need to do this as economically as possible. The piston is a Wiseco, and the rest of the piston looks fine. I know for a fact there are only about 15 hours or less on the piston, and I dont ride hard. Mostly trail riding, and the sort. I am having the cylinder re-honed, and I am going to mic the piston. There arent any cracks. I will have to check the manual to see what the acceptable run-out is on the piston. It isnt a std piston either it is 1 size over (50MM). We shall see. If my stuff that I am selling on the Ocean Auction site sells, I will have what I need..
Bleeds

I just talked to Wiseco. They told me to measure the piston and see how far from the original size is has deviated. He said the intake scuffs arent really a big deal as long as they arent real bad. He said you can dress it a little. He said as long as there isnt more than .001 or .002 deviation I should be ok, since the piston only have about 20 hours at the absolute most. Easy hours too. No mx. BUT the rings need to be replaced without a question. We shall see. Picking up a feeler gauge tonight..
Bleeds