eMachines had a horrible reputation from a few years ago. They were known to have really junky power supplies, and horrible / inaccessible tech support. They changed owners, and have apparently improved on both ends.
If you're on a budget, a hundred dollars or so might be an issue -- but upgrading from a Celeron to a P4 (or even an AMD thunderbird or better) will be worth it in the long run.
Remember, with the integration done by OEM's (like Emachines and Compaq/HP), it's not always as easy to upgrade as it would be for a DIY box.
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