Compressor and air tool question

Get a oil lubed pump, not an oilless. Oilless won't last long and will overheat under continous use. Plus they are noisy as all hell. Like was stated before get the biggest one you can afford/space. It's best to check out the actual pump assembly for service parts and availability. The tank size is a factor but not as important as pump size and output. As you can always add a remote tank if your needs require it. Cast iron pump body with cast iron sleeve, I have seen pumps listed as cast iron but they had aluminum sleeves. I would suggest also the best regulator and filter you can get, along with a automatic tank purge for removing the water trapped in the tank. And check to make sure it has a good sized outlet, not just a 1/2 inch hole only.