I can't tell if that is rose or yellow from this angle. I had a similar one and the dial was like a brownish yellow. Beautiful but transitional period.
They can service everything except chiming watches, Optimum, and I believe the Resonance. The most problematic of all services is the Optimum, since FP wants it to be close to him due tho the complexity of the escapement.
Because it depends mostly on what you have in your collection. That said, if you want one icon to seal the deal I would think a Resonance. The choice of which one I will leave it up to you, no need to be so specific. The Resonance is also a timepiece that nobody else makes and everyone who claims to