Hey RedZed,
Currently the offsets offered are the best offsets for the 370z. Rays really geared these towards the entire Z/G market. The sizing offered is on our official preorder thread but to make it easier, here's the sizing-
19x9.5 +22
19x9.5 +12
19x10.5 +22
19x10.5 +12
19x11 +23
With that being said, if you plan on running close to stock tire sizing, I would recommend the 19x9.5/19x10.5 +12 combo all around. The 19x11 and 19x9.5 +22 would work if you wanted to run wider tires than stock (255-265 fronts, 305-315 rears).
With that being said, all of the other TE's would also work as they are offered in the same size/offset, with the exception of the 19x11 (which is SL only) just cheaper and lighter.
Here's the preorder thread in case you're interested-
.: |SPEEDELEMENT TE37 SL MOLD FORM FORGED- 19 inch sizing! PREORDER SPECIAL!| :.