Sienna sunburst is the best colour for the player series mustang, and one of the few colours that comes with a maple fingerboard. I'd been wanting one for a long time when I finally managed to acquire one last year. I made a few tasteful changes to mine — including shielding with copper tape, new loom, hipshot HB10 lollipop tuners, thumbrest (in 70s position) and a Hi Mass Bridge.
The Pickups sound fantastic to me so I had no reason to upgrade them. I thought about replacing the switch with a blend pot but decided I preferred the simplicity of a switch, however the stock switch was a bit temperamental and I discovered an annoying issue where unless the volume was at 100%, rolling down the tone also affected the volume. To fix these issues I replaced the loom using a more suitable circuit, building the loom using new components — CTS pots, Orange drop cap, puretone socket, and switchcraft switch.