Most paint shops will negotiate if you do some of your own prep work. Lightly sanding the entire car might save you up to $100 and get you better results.

In prepping for paint, you've gotta use the finest sand paper available.... think 280 grit (or finer) wet/dry fabric paper from nearby marina that paints boats. At really rough rusted spots, use progressively finer paper starting with 120 grit on Makita jitterbug power sander.

After sanding (and bondo?) over whatever metal primer you use, get out ther with garden hose and very gently rub down the entire car using wet/dry approach with ultra fine grit fabric paper mentioned above.

Stripping the car of emblems and chrome strips myself, I'd probably leave the masking to them.... any overspray on window trim can be removed with solvent product called "Goof-Off" available at any paint store.

One question you might ask Maco is what sort of paint they use...
Maybe you want to pay extra to get the best Dupont product, instead of whatever ordinary crap Maco usually sells.

Hell, there's no reason to believe that Maco spray techs cant do as good a job as anybody else. It strikes me they just might be using cheaper paint. Reeaaallly good paint can cost upwards of $100 per gallon.

Save money on prep work, and pour money into the paint product being used.... thats my advice.