What car should I purchase? Mazda, Honda, or Toyota?

I'm looking to buy a car soon and am curious as to which would be right for me. I drive a lot for work, probably 150 hwy miles a day or so, maybe more. I also will be taking several trips of 2000 miles per year. I need something gas efficient and reliable that will last a while. I'm looking to spend between $6-$8000. I need it to fit 2-4 people and a large dog comfortably. I live in Denver, CO so something that can handle a little snow, inner city and highway driving would be ideal, I don't really do any mountain driving.
I have previously driven a 2000 Honda CRV that I absolutely loved, I'm just curious as to how that might compare to another similar vehicle. I love the idea of a mini-SUV, I've been looking at the RAV4 and prius as well. I do not want a Subaru, I would never drive one. What can anyone tell me about mazdas? How many miles can they handle, maintenance, etc? I'm very unfamiliar with the brand.

If the CRV worked well, why change? Who driver 150 miles a day for work related activities with a large dog? Did I get that right?