Here is my newest addition, I have had him for 3 weeks, his "hump" is coming in very well. I love his goby like movements and dark blue color. Now I just have to find him a girlfriend. I would recommend these guys to anyone, but they are a little pricey, $20 for a 2" fish that you hope is male.
They're not readily available (at least locally) and like the op said are kinda pricey (especially if shipping or getting a bunch of unsexed juvies to grow out).