Jez go have a talk to some painters or smash repairs. Have a look at their workshops, see if you can get some idea of quality of work.
When I had my rear quarter panel beaten I also got them to respray front and rear bars. Probably ended up having half the car resprayed. They did an awesome job on my car, no issues matching the paint.
This was at David Hand Smash Repairs in Fyshwick.
I had 4 quotes done. DHSR weren't the cheapest, or the most expensive. But I'm glad they did the work