Yeah, there are quite a few different versions of the T100, so just make sure it has everyting you need. For example, my T100 only has one speaker instead of the stereo speakers that some of the T100 models have (it has a speaker grille on each side, but only one speaker!). They change little things like that so that they can offer certain models to big-box chain stores as exclusive models - and for discount prices (helps them avoid price matching competitors too!).
I think mine is a T100 TAF model. Obviously, for what I do with it, stereo speakers aren't needed - but if you also wanted to use it for playing movies or something, you'd probably want a model with stereo speakers. Some models have less RAM (mine has 2GB RAM), some even have slightly different processors. So just pay attention to the details...