Hi, I want to buy some power tools and am not sure if I should buy a compound miter saw or a circular saw. I am leaning towards a miter saw as the circular saws are heavy. I would only be using the saw for straight cuts on some outside replacement siding and inside baseboard , molding projects. Are miter saws only used for angle cuts? Also I really want a nail gun. The new ones that do not use an air compressor look to be heavy and cumbersome. Are they? Thank you JC