I reckon that it would be a drastic change having the windows tinted. Mine came in with factory tints in the rear and rear window. My car being black, they look even darker than they actually are. Plus, they are useful in hot days and give a nice touch. Getting them tinted I reckon shouldn't cost silly money.
Lenny got his done aftermarket and would be able to give you a guide price roughly.
Welcome to the forum and love the colour of your car. My suggestion for the next mod will be to get the rear windows tinted as I think it would look ace with the car colour. Also, a nice rear diffuser would set it off
I think it looks way more expensive than it actually is. I have seen other makes with similar models and they looks amazing on BMWs online. Plus, I don't think I have seen a Focus with them here. Most of the online retailers have a package with the spiggot rings and some with even the nuts required. Might as well start saving now for next year