What is the best window tint for the price?

Hello,
I am a proud new owner of Prius 2010. It came with the original factory tint, but I live in Austin, TX, its not enough.

I want to buy the best tint that can block out heat/light?

So I thought I would get yals opinion. I know it would help with MPG, if I could cut the AC down.

I don't want to break the bank, but want a good quality tint.

Also, I assume the original tint needs to come off before the new goes on.....?

Looking forward to yal's suggestions