Metric sizing is most common for road tires. Your size is 700 mm. 32mm wide would be a fine width. They'll be a balance between speed and traction. Gator skins are stupid tough, I'm running them currently on my road bike. Really the only time slicks don't get that much traction is if it's in the rain. I'll find some tires and tubes in a sec.
I might pick up a trilogy to make a badass pump as you have. It'll be my first pump
Although it'll be pretty cheap, $80 for the gun, then a $30 pump kit and an on/off with macro and maybe a reg and decent barrel. The Internals and pneumatics I could care less about lol
I'm doing the exact same thing, but I got my trilogy for $40. sure, it's leaking out of the pneumatics, but I won't need em.