Regal Tang + Other tang??

[doch]

On my stocking list I had put the Regal that I already have, and either an Achiles or a Powder blue. I've been doing some reading since and found that the Regal is classified as peaceful, but the other 2 are aggressive. Both say to not put with other tangs. Anybody have good luch with either of these guys with a regal tang? In my first tank way back when, I had a regal and a powder blue, but they were both young.

If either of these tnags are a bad idea, are there any that would work well?

FYI, I'm running a 160 gallon... 48"*30"*26"