I am not super picky with what car and what lightbar, but I do have a few suggestions, which will automatically make your pack 100000% better!
First off, include multiple lightbars in one model! I love being able to have one car in one slot, and then have the option to change lightbars, or even go slicktop using the same skins and features of the same model. That would for sure make me love the models!!
On a similar note, I'm a huge fan of extras. Spotlights, pushbars, the whole lot!
Lastly, include slots for multiple skins. It does bug me when models only have one skin....
Anyway, this sounds really fun and I can't wait to see what you come up with! On the topic of skins though, I have started to make textures and am currently working on a pack, but if you need some made up for your models, let me know! I am totally up for teaming up and working on this together! I can also make release videos and screenshots for you when you are ready to release the pack. Just let me know!
Can't wait to see what you come up with,
Max