nothing wrong with gravi-fed guns at all, whoever told you that has no clue of painting.
just try get yourself an HVLP (High Volume Low Pressure) to cut down on excess overspray and wasted paint.
you'll need compressor, airline, brass fixings for the ends, spray gun, water trap (maybe optional but id get 1), assortment of sandpaper dependant on if theres damage or if you just want it repainted, paint, laquer, primer, thinners, hardener, a rotary polisher, masking tape, masking paper, mixing cup (about 3 or 4 will be fine), mixing stick (any bit of clean metal is fine or a clean screwdriver), couple of paint strainers.
most importantly, a clean dust free place to spray it, if youre doing it in a garage then give it a very very good clean out, brush all the ceiling down and wet all the floor when youre painting to cut down on the dust