hard to choice what size i got to change.

14" on Myvi now going to 15"/16"/17" ?
and need tyre suggest too

thanks alot 

im still confused of replica, china brand or taiwan brand rims..
how to know if the shop guy is ripping me off by selling non-original rims at higher price???

well, replica china or taiwan are relatively the same as they are replicas afterall. 15" should be priced around 800 for brand new replicas. Original brand new rims will set you back double that price or more.

Check out advanti rims as last time i checked they are priced slightly more expensive than replicas but the quality is quite good. Design varies by shop so check them out.

just compare with one type of tyre

Micheling PS3

195/55/15 - RM250
205/55/16 - RM520
215/55/17 - RM590
205/40/17 - So far didnt find this spec on michelin tyre

if for myvi, is suggest

For cheaper tyre and good performance but comfort wise is low (sound a but noisy)

Falken ze ziex 912

195/55/15 - RM200
205/55/16 - RM290
215/55/17 - RM330
205/40/17 - RM300 - fitted myvi

please, if got money dont buy other model of falken other than Falken Ziex 912 and Falken PT 722..in my experience with falken, only this 2 modal is nice to use and nice to drive.

and unfortunate Falken PT722 the lowest spec is 205/55/16..no spec for 15inch