Rondell rims 18°

Hello guys, I bought new rims and tires for the summer at D&W today.The new summer Pneu’s are Goodyear Eagle F1 235/40/ZR 18 Y the latest model, look forward to the spring.The rims are in size 8.5×18. I paid rims and tires 1.700 €uros, is that a good price or is the price? I currently have 205/65/15 Goodyear winter tires on it, and if I mount the new set, will the car lose a lot of agility? And my last question on the n Rims is the Rondell logo above, how could I best replace it with a BMW logo, I don’t think sticking on it will look very good. There’s another photo of the Rondell rim Thanks in advance!