Thank you guys for all the responses. Truly appreciate it. Guess i have to really tighten up my belt for the next couple of months for those Japanese rims then. If i manage of survive those few months of fasting....... i will give SuperTram a call. 8-)
I suggest Yokohama Advan RZ - A true light weight performance wheel; reduce the cost of losing power after upgrade to bigger wheel. Design and built by Yokohama Tire in Japan.
Spec:
Dark Gun metal color
19" 10J Rear and 9J front.
Offset +25 with minimum camber adjust -1.0 degree front and rear.
You need to consider these issues when upgrading new wheel.
1. Many people know that big wheel can allow you to upgrade to bigger brake. Yes, but there is another aspect which most people forget, good brake system comes with bigger and wider caliper. Some wheel design not allow you to have bigger and wider caliper, the problem caused the spoke location and angle; as the result you need to put spacer to you wheel.
2. Regarding power lost in bigger wheel; wheel weight is an issue, not the size, of course bigger wheel normally heavier than smaller wheel. However, there are many famous brand wheel in market made by light weight material; bigger, lighter but tougher. Advan Wheel is one the them.
General rules is every increase of 7lbs in wheel will cost you 1 house power.
3. Offset of the wheel, if your Z is between 2003 and 2006, not 'upgrade' to wide body, make sure your front and rear wheel offset should not less than +22. Stock 18" wheel offset is 30 for both front and rear.
4. Avoid using spacer, it cause handling problem to you car in heavy braking.
5. Wider wheel with wider tire give you more traction / grip on dry road. If you take my advice on the offset; 10J rear and 9J front should be the maximum width of the wheel. FYI, you can fit 275 to 295 tire on 10J wheel, that is more than enough.
I'm not really want to advertise here, but just for your info, this ADVAN RZ is no way to be found in Malaysia (according to my survey in Dec 2009).
If you interest in this wheel, I have 2 sets, 19" and 18", I'm using 18" at the moment. The price is not cheap, 10K per set.