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The added sensitivity of the Ultra comes at a speed cost. From most reviews I have seen, the tradeoff isn't worth it. The i-trek, from Semsons, is a "clone" of the GM270, I believe. You can check the specs for both to verify that.
Another good receiver is the Haicom 303 foldable. It's a bit larger than the Holux, but it folds to a smaller package and can be used as a Serial "mouse" GPS as well as a CF GPS. It comes with a cable to attach to the receiver and a PS2 plug on the other end.
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