I have a celeron OC'd to 2.8 and it runs respectably, but sometimes the system bottlenecks at the processor and that's just because it can't keep up with the rest of the system minus the HD's. My celeron also runs hot, 40C idle and up to 50C or more under load, and that's with a 120mm fan blowing straight into an arctic cooling freezer 4 HSF and an exhaust 80mm directly above the HSF.
I don't mind the celeron, it works well, but I would recommend an AMD especially if your gonna do any gaming.