The Ibex seems okay for the price.
I don't know anything about the 6061 alum frame.
I would think that the Aprisa Elite 5500 would be a good starter bike. Like we discussed earlier, if your looking at improved performance, you may consider the 6500 model. It has the Ultegra 27 speed set-up, nice wheelset, comfortable saddle and handlebars, and its about 3 pounds lighter than the 4400 model. Doesn't sound like much, but it makes a big difference when you're climbing hills.
The aluminum frame is probably fine, but like Steel mentioned, I would look into a little bit more, as I don't know anything about it.
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