10bit color output is quite separate thing from color calibration. You can have 10bit panel with 97perc. sRBG gamut coverage and 8bit panel with 110perc. sRGB coverage, the latter will be more precise.
In general, very few digital artists even benefit from it, the main clientele is medical and print.
You almost never suffer from banding either as 8bit panels usually support RFC and so does additionally Photoshop.
Using weak Quadro in this age would be a total waste of money and performance. Just forger this thing even exists :- ).
Definitely do get color calibration sond, ideally iDisplayPro from X-Rite which you will be able to use on almost every monitor, whether hardware (internal 3D LUT storage in monitor OS) or software (through GPU storage LUT) calibration.
No need for any service, the software is fully automated almost, it takes few minutes and 5 clicks to run.