New Calculator for Computer Engineer

Ok, so one might assume that the computer engineer should be able to figure out which calculator to purchase. . . and yet . . .

Recently lost my TI-89 and I am looking to replace it with the same or better.

I am most confused by the NSpire technology. Wikipedia shows that line as having a better cpu, (and as TI's "flagship" line) however I get the impression from TI's website that it is more of a "learning" calculator.

These things last forever (until I loose them) so I am looking for the most bad ass I can get.

Any recommendations for a top of the line Engineering Calculator? (Voyager? 89 again? NSpire?)

Thanks!

Edit: I figure I would add some info,
I am no longer in college (except as a grad student) and I use my calculator for a lot of things, it's something I always have in my bag. I use applications like Matlab, Mathematica and Maple, but there is something to be said about having as much of that power in a portable device as possible, albeit a calculator would never match. However when sitting in front of a work bench being able to do some basic calculus or plot a signal etc is priceless.

I am looking for top of the line not because the TI-89 was insufficient, but because of the longevity of the devices I might as well. If TI-89 is tops, so be it, however if I can get some extra umph that I may use now, or later on, it is worth the investment. (what's $300 for a calculator when I pay thousands for Matlab?)

Oh and gadgets are cool!