Just about to round out my first little shop here and I'm on the lookout for just a few more tools. I've been getting to know the used market in my area and making buys when they seem like a deal. But as I'm less familiar with these last two I thought I better get some advice. For my jointer I'd really like to find a used 8" but those don't seem to come up too often, and really I'm not sure that the 6" ones I'm seeing are all that either. Ideally I'd like to find a cheap 8" not working so I could put a couple hundred in and have a deal, but so far that's not looking too likely. I know for any used piece of equipment like this I can expect to replace the motor, knives and the like. What I need to know in order to avoid any (more) pitfalls is how to inspect a jointer, I'm guessing with a good square, to make sure that the tables are fundamentally square and sound. Additionally, what should I be looking for in table length for both a 6 and 8 in? Of the two tables, is the length of the output the more important?