:thumbsup: Awesome choice, man. I have a 007 (same as the 173 but with round hour markers) I wear on a black zulu. I should have gotten the 173 though, because I like the look of the square markers better. You will not be disappointed!
The way the second hand sweeps instead of "ticks", the musical sound of the movement when you hold it up to your ear and the sound of the 120 click bezel, the solid weight on your wrist will almost make you forget the fact that the watch gains between 10-30 seconds a day. At least you'll be early instead of late. It's just a fact of life with automatic watches. If you think about it, it is really cool though, a machine with no circuits or batteries, a plain old mechanical device using gears that keeps time. Seiko makes a great automatic diver's watch, I don't think you can beat it for the money.