I second substance incorporated. I've used them going on 13 years now... They originated from the offroad side of the industry, or from what I know them from is the Motocross, and the dirtbike industry. They were our standard back then, and really the only one everyone uses for motocross or offroad graphics. They have the media- Ultracurve 660 which is a 6 mil SUPER aggressive adhesive, and then we laminate with the Ultracurve 1500 usually... 21 mil for Motocross and offroad/snowmobiles etc... They just recently, the past year or two came out with the more spiffy stuff like the Atlas and Galactic series', Which galactic is Gold Flake finish within the clear laminate, and same with the other colors they offer within that category (i dont use it much, kinda pricey, but fun to use on occasion.) I do want to mention, it IS, very very subtle, so that's nice for me.... it won't wash out any of your design by any means. I recommend like 'NOTAREALSIGNGUY' said, asking for some samples or buying some sample rolls to try out.
I even now use them to replace my thin oracal stickers with the media pm 2755 and laminate with pl 3750 and it's way better than oracal and avery in my and others alike opinions and the pricing is better too! I have lived on both costs, and in the midwest, and always get in in 2 days of ordering, at most 3. Which is tremendous. They have a warehouse in the San Diego area and then another warehouse on the Southern Half of the East coast somewhere. I have never had anything bad to say about them in like i said almost 15 years!