That car looks TOO GOOD as it sits right there (and you don't even have the splitters and carbon mirror caps on it yet!).
You really cannot go any further on the exterior aesthetics without the major surgery, bodywork, and paint of some big flares/box flares, or an un-streetable full time attack front splitter, and huge rear wing.
Yes, Accel Junky chronicled the Titan rear center cap dilemma in his build, and others have had to do the same to get the Rota caps to work.
The silver caps DO look great, and yes, DO give a nice contrast, and pick up the body color really well.
SORRY to hear about the face dropped Titan.
I did that once to one of my A2 GTI 16V's black Revolution wheels, and it bothered me FOREVER.
I am now super extra-OCD careful with the Pro Race 1.2s, especially since they are somewhat convex in an ET 42 17x8, and even the lip/edge on both sides sticks out past my 215/40 RS-RRs.
Do the Star Specs 'sing'/whine at speeds above 30 MPH
at all (like the RS-RRs do LOUDLY), and if so are they bearable?
(I am considering them and the Yoko A048s in 215/40-17 for the next rubber on these wheels/)