Forget your co worker. There are many better than that. And the Koomang name is only a made up name by whoever sold it to him or he made it up himself.. It means nothing to a fish's beauty. Go check out these sites.
www.aquabid.com
www.aquaticwonderland.com
www.flowerhornsfrombeyond.com
www.flowerhorns.org (group buy)
www.flowerhornrusforum.com (group buy)
www.flowerfish.com
www.penangseagarden.com (order through aquaticwonderland.com)
There are a few more I can't remember but don't you think that's good enough to look around?
Your co worker will be asking you later where you found your fish if you dare to get a nice one. You tell him what you like. His fish is nice but not all that anyway. Trust me, you'll find better fishes than that.
Good luck.