Ok, I do have a 5 1/2" Ryobi circular saw. But it is cordless and don't think that size will do what I need later (for everything). So, my question is which saw out of the three is a "safe" first saw? My first project is going to be interior trimwork. However, once the weather is back to being warm, redoing the deck, bookcases...others. What do you guys think?

I'm redoing all the drywall from 4' down in my house (Katrina flood) and will be doing the orange peel texture myself. But I don't want to screw it up. I bought a "Spraying Mantis" texture hopper/texture gun and an 8-gallon Central Pneumatic compressor. This is not an oilless compressor. I know nothing about air tools. Do oiled compressors blow any oil in the air? Should I even worry about this? I'm going to spray watered down drywall mud for the texturizing, so I'm not concerned about moisture in the line, just oil. I'd hate to have oil "blooms" on my wall 3 months after we move back into the house. Do it right the first time, right?