I would agree with pretty much everything that has been mentioned here. Iv had a couple different plasma systems over the years, running 24/7 in the automotive industry. Now i have had the luck to move up to lasers. Build a water table, you cant beat it. Especially for smaller shops, it keeps so much dust and smoke down. All of ours we just used an air compartment and valve to raise and lower the water lever. Most of the time we would cut with the water about .25" below the plate, but some people have the plate actually in the water. As far as the different companies out there, its hard to say. All of them use someones else's power supply. Either hypertherm or thermal dynamics for the most part. The power rating on this is what is going to give you your cut thickness. Higher end machines will be water cooled and lower end will not. Unless you are burning plate 8 hours a day all day long I wouldnt worry about it. I would focus more on table design as far as the drives and the track they run on. This is what is going to give you a better cut quality than anything. You can spend over 100k on a high def plasma, which cuts almost as good as a laser or 80k for a standard plasma. The only difference between the two is the drives. I know this is the far extreme, but just using a reference. Try to find a company that has more than just a single drive on the Y axis. This will normally create alot of slop in the cutting edge. To move up to dual drives will be costly but worth it, imo. There was a company here in Ok that used a single drive on the Y, but had a shaft that went across the gantry and was geared on each end. The rail side with the motor also turned the shaft, which in turn went to the other side of the table and there was a track on the other side for the gears to turn on. The reason for this is that it eliminates alot of swinging motion from the gantry when the machine turns corners or switches directions. Hope this helps