aggressive stocking list needed

Hello All,
Looking for some advice. I'm almost ready to stock my 144 half moon fish only aggressive tank. Currently in my holding tank (58g) I have a 4inch red tooth Niger trigger and a small undy trigger. I'm almost sure I will need to get rid of the undy once she gets any kind of size on her due to how aggressive they get. Right now the Niger has enough size on the undy that I have had zero problems. But I am really happy with the niger and her size and streamers. What Im looking for is something that will be easy to get here in Des Moines that will live happly with the red tooth but still be consideratered a aggressive fish. I truly love "smart" acting fish that are active. I would love to add more triggers into my 144 but I know Im playing with fire adding anymore then one type of trigger and this red tooth is looking to be the one type I keep. So my question is, what kind of stocking would one look at for this type of tank? I love triggers because they are "smart" acting, are active, and truly easy to take care of. Not saying I dont take care of my tanks, but I dont want to have to do a water change every other day....thats why I stopped keeping a reef.Im looking for something that I will add more color to the tank due to the niger's lack of color. I have thought about harlquin tusks, imperator angelfish, some sort of ballsy puffer?  a foxface of some sort? Truly appricate any help with getting this stocking list ready. Im about 2 weeks from getting this tank ready and want to have a soild game plan going into the mix. I really love triggers and want to try and get them worked into this tank setup so any help keeping this niger in the stocking list would be much appricate.
Thanks Again /DesktopModules/ActiveForums/themes/_default/emoticons/cool.gif
Derek C.
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