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TI-89 all the way. I have a Titanium, but it's really no different than the regular (except for the usb port, which is kinda neat, but I haven't had a chance to use it yet). You can even transfer the TI-89 Titanium OS to the regular TI-89 (haven't tried it yet, but I saw that there was that option. So, anyway, TI-89 should be enough for most situations that you will encounter. It's still good to have something without the algebra system for times when you can't use one (my suggestion is a TI-86.
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