As much experience as you've had i'm sure you've had most everything, when I set up my 75 gallon I had decided I wanted a GT and had set it up as a decent semi-aggressive community, but then got attached to a red oscar at work and now he's my favorite fish (took some rearanging of fish but all worked out) - as far as personality if you find a good specimen I don't know a whole lot better, he's only been in my tank since monday night and i've already taught him to jump to take food from my hand lol