You are in no way, shape or form stupid and I did not mean to make it sound like that is what I meant and in fact normally I would have been skeptical about a 16 year old building a shop and buying a big compressor but I have no doubt that you are going to do just that and I find that to be very impressive. I started out very young also and I have spent my entire working life as a welding shop operator serving the mining and logging industry since the early 70's and part of my business has been installing air compressors and building air systems for service trucks, mining machinery and shops. This thing about tank size is the most mis-understood thing about compressors and why would'nt it be? Just about every ad you see for a new compressor lists tank size and HP numbers as the most important features for a companies unit because these outfits know that "BIG" sells. Big HP numbers make a compressor seem powerful because people can relate to horsepower and they can see a big tank that LOOKS powerful but CFM numbers are something most people just don't think much about, when all else is said and done most of the cheap units that LOOK and SOUND big will barely make enough air to blow your hat off much less run big air tools. Now after having said all that, the compressors you are looking at are all good choices and should serve your needs. The Eaton is a really good outfit but my all time favorite is Quincy as these things seem to be nearly indestructible. A co-worker of mine has an old gas Quincy that has worn out two engines and a tank over the last thirty years but that pump is still going strong!