Brake Disc Size

[Whazza22]

Hey all,

 

I have a 2003 350z Jap Import and require a new set of front and rear brake discs.

 

I have seen a variety of sizes such as 295mm and 324mm for the front and 292mm and 322mm for the rear.

 

I have standard rotors and calipers. Does it matter which discs I use? 

 

Or is the larger size for the Brembo calipers?

 

I only do approximately 6k miles a year and that is mainly town driving. Are vented discs essential and does it matter which brand I use or is there some brands to avoid?

 

Any help much appreciated.

 

Thanks

 

Mark