Which fish first

[gregzz4]

So nice to see you giving some positive feedback about tangs Wayne

Prarie, if you build the tank size you mentioned, you have lots of room for adding fish ...

Honestly, I'd think any fish added at any time would feel so lost in there (not like at home in a real reef, but) that any aggression would not be an issue
Bbllinks has a 300DD full of tangs and it's a very peaceful tank

Still, I'd suggest you stick with the obvious rules about who to add first, and how many of each family/sub etc to keep
Some are more aggressive than others, so do some web research and make your choices slowly

Also, the Yellow Eye Kole Tang mentioned is an awesome fish
I had one for a short time before selling him. It would fit in great in a tank your projected size

Liveaquaria.com is a good place to start for stocking suggestions, but it's not gospel
They also have a compatability chart you could utilize for any other choices regarding mixing all the fish we can buy