What a beautiful cat. I need a good mouser too thanks to Katrina and Rita, they had more sense than the citizens of NOLA, that's unfortunate for me though. Ever since the hurricanes the vermin and creepy crawlies have been bad. That's the price of living in the country though.
My last cat, a Russian Blue, was useless as a mouser. She ran the other way if she saw a mouse. She was 18 when I had to put her to sleep in the spring due to a herniated disc. She was old but ruled the roost and kept the dogs in line. I am going to adopt an older cat from the shelter instead of getting a kitten because of the dogs.
I've always adopted older cats, or rather, had them adopt me. It's been ~years~ since I actually went out and looked for a cat, they usually just show up about the time I need one :~D And it's been since I was a kid since I've had my own kitten.
My old kitty does pretty well at mousing, but he uses the 'sit in one place and wait for a mouse to come by' method, which works well if he chooses a high traffic area of the barn, but we could use a more active hunter or two around also :~D
My dogs do really well at wanting to catch mice also, but they are too big to follow them into the crannies they need to go into.
Get an orange tabby. They are almost always male (which is what you want in an orange), they live forever, they have wonderful personalities, and he will catch your mice.