The 1.2 is not that much more than the 1.1celery too and this chip will smoke a duron as the fastest they can generally hit is 1200MHz.
A 1.2GHz Duron will certainly beat a 1.2GHz Celery, no question.
Read up here.
However, don't even think about getting a 1.2, 1.1, or even 1.0GHz Duron because they're all more expensive than much more powerful 1.2GHz Thunderbird processor, which is just $93 shipped at
newegg.
A 1.2GHz Celery can't compete with a 1.2GHz Duron, and certainly doesn't stand a chance against a 1.2GHz T-bird.
Besides, unless you wanna go through the trouble that
this guy is going through, a motherboard for a 1.2GHz Celeron is up to twice as expensive as a comparable motherboard for a 1.2GHz T-bird or Duron.
Btw, who says a 1.2GHz Celery will overclock better than a 1.2GHz Duron. The Duron's multiplier isn't locked like the 1.2 GHz Celeron is. So if anything, it would be easier to overclock a 1.2GHz Duron.
Just to recap, you can get a 1.2GHz T-bird for $93 shipped at Newegg. The cheapest price for a 1.2GHz Celeron on pricewatch is $118 shipped. The T-bird will nicely take apart that 1.2GHz Celeron, so the 1.2GHz T-bird is your obvious choice. Not to mention you can get a bunch of very inexpensive motherboards for that 1.2GHz T-bird.
EDIT: I found a 1.33GHz Athlon XP (enhanced Palomino core, which is better than T-bird core btw) for the exact same $118 shipped that the 1.2GHz Celeron was priced at on pricewatch. A 1.33GHz will tear apart a 1.2GHz Celeron in every way imaginable.