Which camera, D80 or xTi?

[FateX8]

So here's the dilemma. I just graduated and my mom said she will get me any camera I want. The question is which is better, D80 or Rebel xTi? I don't want anything too expensive so these are what I'm limited to. I figured either is ok but I would like opinions to make my final choice. PLEASE NO BASHING ANYONES OPINIONS. ONLY ONE OPINION FROM EACH PERSON PLEASE. I know the xTi has been out for a year and the D80 has just come out so probably not as many opinions on that. I would like to take fast frame photos if possible with these. I am an amateur at best but willing to learn. It's just that it's hard to learn if all you have is the internet because they use all these mumbo jumbo terms. So which is better and why...not because one is a Nikon or one is a Canon. Also this camera will mainly be used for taking pics of fish and corals in tanks.
TIA
Mike