Couple Questions...

i have a couple of questions about my newest project. i want to have either a 75 or 90 usgal tank with one big mean red devil. i had one about 8 months ago and got rid of him because he was a killer, now i want him back. i want a male, so how do i go about buying one. my lfs never carries larger fish, so i would need to basically guess from their juvenile appearance or what? also what would be better the 75 or 90. i know how they like to have the tank to themselves so thats what i plan on. I was also looking at red terrors. i've never had or heard much about the RT, are they quit comparable? i like the "KING OF THE TANK" attitude the devils have, but the RT might be a little more attractive, what does everyone think? let me know thanks.

Also, I Just Talked To Someone At A Lfs, And They Have A 75 Gal (48"x18"x20"high") With A Stand, Glass Cover, And Strip Lighting Going On Sale For $249.99 Sunday. How Does That Sound To You Guys? Would That Be A Good Home For My Devil? Sounds Like A Deal To Me.