I may be biased because i have the TE37's, but i like them both. Do you have any pics with the G25's on a Z? As far as being played out, there is a reason, the TE37's look F'ing good on the Z. So unless there are a lot of Z's in your area with them, then you should be unique. The SL's are also light weight...i'm not familiar with the G25's so i'm not sure how they compare. Personally, i looked at hundreds of pics of Z's and wheels and did photoshops before i made my decision. I think the two you have suggested are both good for the Z, maybe get someone to photoshop them with the same color as your Z.
Also, if you have a White Z, the F-Zero blue TE37's would look so bad A$$.
