Should I go with 205, 215 ? 55, 50 ?

thanks

205 55 is stock, but 205 50's will work. I don't know about 215 though. It's all just a matter of preference the 50 series will have a sorter side wall by roughly .25 to .5 inch. and 215 55 or 50's will look basically stock because of the extra width in the 215.

225 50 15's looks mean and handle well

I'm running 195/50/15 and they look great. You can see difference in the profile. It also handles better.