I think when you're spending this kind of money anyway the price difference between 2LZ and 3LZ (particularly if you're adding nav to 2LZ) is essentially noise.
Unless there's something about 3LZ that you legitimately dislike you'll probably regret not getting it.
I assume 2LZ/3LZ correlate pretty much directly to 2LT/3LT?
Viper GTS
They do. Entirely. I'll likely end up with the Z07 package with 3LZ. Right now I have the 3LT with Z51, MRC, and NPP. It's more just a mental hang up about paying over 100k for a car after taxes than anything else. I do have to get some dimensions and make sure that the lower splitter can navigate my drive. If it can't, I will have to lose the Z07 package because it isn't available without it.
Or just take the front splitter off and only install it when you are going to the track. I'm assuming you want a Z07 package because of the brakes (that's the major selling point and cost contributor anyway). Seems kinda silly to not just remove the splitter for DD if you really want the carbon ceramic brakes.