Hey, wanted to chime in here. I did a lot of research on tint before I got mine and wanted to share. Each brand has their own lineup. Basically, the bottom end are dyed films and metallic films (~$100-$200 for 9 windows), then carbon based films, then ceramic based (Seen quotes from $500-800 for 9 windows). The dyed films need to be darker in order to block more heat and can fade. Metallic films can mess with your radio/radar detector. Carbon and ceramic can block heat very well without having to resort to lower transmittance.
You can't go wrong with any ceramic based film from Huber Optik, Johnson, Llumar, 3M, etc. I have 3M crystalline and Solargard Ultra performance and each have their own distinctive color look to them. For example, the 3M crystalline has a silver sheen look and the Llumar Air Blue has a blue tint to it (seen from outside the vehicle).
If all you want is to match the windows and just look dark, I agree with many of the previous posters. Get it done at a reputable shop and get warranty. There are two types of warranties, the shop's and the film's. Ask if the shop warranties their work and hopefully they stay in business for a long time. Film warranty is if it discolors or falls apart, then any shop that is an authorized dealer of that film can replace it for you.
Long post I know, but hope it helps.