I'm going to look at a dual 2.5 tomorrow. In all honesty the LCS G5s scare me and I've mostly stayed away from them, but this one is at a decent price and already has some upgrades(i.e. 8gb ram). This one supposedly is running and claims to have a recent clean install of 10.5, so that's at least a good sign that everything is working for now. I know to look for corrosion or other signs of leaking under the processors, but am wondering if there's anything else I should keep an eye out for.