Hi,
I know this is more expensive, but at least consider getting a reserved car from the Dusit in advance. After a long flight or flights, and hitting the craziness of terminal 1 at night, I appreciate being able to just walk to the hotel ride area and wait for my ride. I know I will be safe and will make it to the hotel timely and in comfort. Some cabs are not the cleanest, and others can't fit large luggage well. Going back to the airport, a cab is always fine as you can be choosy on which cab to take.
Terminal 1 is not a pleasant place at 10PM. My first time arriving, I was totally lost trying to meet someone and ended up walking into traffic without realizing it.
At least consider the reserved car from the hotel.