RIM size on 2009 g37x coupe

[azndopee]

Hey guys, i need a bit of help here.

I bought the 2009 g37x coupe last yr dec and the stock rims were 18 x 8.0-inch aluminum-alloy wheels with 225/50 R18 V-rated all-season performance tires

then i bought winter tires without rims and just utilized the stock rims..however this year i want to get winter rims and not sure which ones are appropriate for it...notice the stock tire sizes and the tire salesmen here in town for my winter tires recommended me to purchase the nokian hakka Rs 225/40r 18

after they were mounted i noticed that there were low profiles..didnt know they were until they were mounted which is stupid because they are winter tires and i could care less..anyhow im stuck with them ..they do work great in winter...

i want to purchase rims fo these winter tires..and the same store told me to get 18" 5x 114.3 at 18x7 to 9...and i would like to narrow it down..which exact measurement should i get and what offset measurement?

im looking online for deals..for something decent looking and found this websitehttp://www.discounttiredirect....nivan

they showed 18" but with different offsets...not sure what offset i should use and what it really does for the vehicle..

anyhow your help would be appreciated..

[audtatious]

http://forums.g35club.org/zerothread/342067

Offsets and such are listed in the above stickie thread