If you are upsizing your rims, your recommended tyre size should be:

195/55R16, 215/45R17 (i did not recommend to change to the same tyre size as polo gti 215/40R17 as the polo gti has a 15mm lowered ride height compare to the standard polo)

Bro, just google about tire size comparison. There is a rule that no bigger or smaller then 3% in term of diameter if you care about.

https://tiresize.com/calculator/

If you want to upgrade to bigger rims.  You also need to know the rims width & offset to match the wider tires and also to clear from the brake calipers.

My personal advice dont direct upgrade the width too much from 185 to 205/215. Jump to 195 first as wider tires does impact fuel economy. If i am you, i would like to get 195/55/R15 tires and maybe get a wider sport rim 6.5" to 7" wide to match the 195 size. 15 inch tires & sport rims is more affordable and choices in market.

https://www.tyresizecalculator.com/tyre-whe...idth-calculator

195/50/15 is too small in diameter compared to your stock size. You can use 195/55/15, slightly smaller but still within tolerance and more choices of UHP tires. PS3 is the best choice here, followed by probably the new RE004 and GY F1D5.

205/50/16 is slightly larger than stock diameter but still ok. You might experience slightly heavier acceleration. Best choice is PS4 here. For 16', the closest conversion to your stock size is 195/50/16 but this size has less choices. Try to find the new GY F1 Sport, possibly the best choice here.

215/45/17 is too big. For 17, the closest one is 215/40/17 but this size also not as common and it's pretty thin already hence your ride will be pretty harsh/bumpy, so IMHO not recommended to go 17.

As for CC6, forget about it, it's lousy tires in terms of grip and performance! It's only good for comfort, silence, and longevity. It's the lowest and cheapest category from Continental.

For rims, try find Konig or Advanti Storm, both are good quality light rims from Taiwan with very affordable prices (less than half the price of similar quality Japan rims).

Just pay a visit to king of rims and let Jeff poison you