anyone know the latest price for 155/70/12? also which is better for comfort and performance

Most rim brand you mentioned I think from Taiwan, just make sure the rims is lightweight otherwise you will suffer lost of power especially at low gear. You can put 195/50/15 or 185/55/15(this size not many choices0, if put 195/55/15 may be rear tyre 'kena' body if full load.

If prefer Yokohama can go CDrive 2, good & comfort. If want cheap/budget can try Neuton NT8000/5000.

As I stated 195/50/15 & 185/55/15 will give no problem only 195/55/15 if full load may be get problem. It happended to me. Anyway Myvi can fit maximum with 205/40/17, my two ladies staff ask theirs husband used it to theirs myvi (look nice) but suffer with comfort. One of them changed it back to 15" rims, she said using 17" rim her car feel like no spring & no power plus high fuel comsumption. 

I think you should try it first with 17" rims & give us the feedback.

usualy use 205/40/17.but myvi can use 205/45/17 without sport spring.my colleague use 45 series looks nicer.

btw which car u driving bro?viva?