skilling up engineering for the last stretchFollow

Currently, I'm in my 250's with engineering and the trainers are almost completely out of recipes to teach me. I can skill up on mithril gyro-shots but that will eventually be exhausted. So now I need to buy schematics the rest of the way. What are some good ones to skill up on? I will eventually go for a complete recipe list just because I'm crazy like that but for now, what's good for skilling up or just handy to have right now?