....I should add that today's Celeron may be better. I remember when they first came out with the Celeron, all the tech people I knew were warning me away from buying anything with a Celeron processor because of issues of compatibility with Windows. I think this was around the time that Windows 98 was coming out as well.
However, that was before Intel started making the celeron. Now, they might be okay, but I am pretty leery of using anything other than a Pentium just because of those issues that cropped up several years ago.
I had a professor who insisted that AMD made the best processors in the history of computing, but he was pretty weird. Most people don't need anything more than a Pentium 2 or 3... heck I know people with computers that still run off one of the old "x86" series processors.