Ok, since you told me that the infiniti one is for all their g coupes (but still fits the g37 nicely) i think I will get that. It's a bit cheaper than the covercraft one but the same thing. I found it for $217 (w/o lock) at MyNismo.com for the 2003-2006 G35.
http://www.mynismo.com/products/?id=3006
Probably will get the lock seperately still, but it's the cheapest price I've found so far. I will continue lookin around for myself and other NICOs.
Since it's the same for both Gs.. is it the same as the 2dr altima's cover? Should I look into getting that or JDM cover if it's substantially cheaper? I wouldn't mind tooo much to have my cover say Nissan or Nismo, but I would prefer it to say Infiniti or Covercraft. Does anyone else have a different cover that they just really love and would recommend? If not I'll probably end up getting the Infiniti branded Covercraft Weathershield one... Hopefully it fits the G37 fine, as mranderson says it does. The G37 is a little bigger — an inch longer, fraction of an inch wider.