There should be plenty of nice Black Walnuts and probably a couple multiwoods at $175 so you might be in luck. The Purplehearts will be the lowest priced ones for sure (as far as our plans go) at the $150-$160 price range. Further cracking isn't typically an issue and certainly not structural-going-to-fall-apart cracking.. PH is just really prone to superficial/cosmetic cracking from heat so we discount the last big batch we made and then stopped using it. As far as the cores go I think the SC2 is the way to go though occasionally someone prefers the SC1. Once I use up the last of the SC1 cores we already had parts for I suspect they'll be gone for good. Most of the vapes will be SC2 but there will probably still be some SC1 here and there. I don't have good enough internet to go into all the specific differences (bad wifi in this part of the Mexican desert) but you can find it by searching the thread or maybe someone can repost it.