If you go the DIY route, try to get the rust out of those chips before you start painting. That'll help the rust converter do a better job before you paint. Rust is porous and even rust converter might not get it all if you don't grind the bulk of it away. I'd use either a dremel with a small wire wheel or a bit of sandpaper wrapped over the end of a chopstick to do some very precise grinding. I've not tried this, so maybe someone with more experience can weigh in, but would it be a good idea to build up a thicker layer of touch-up paint in the chips, then wet-sand back to flush and buff smooth? Seems like a little elbow grease could save you from a larger spray job.