Oops, I forgot to tell that my current processor is a Celeron II 667 MHz My mobo can handle FCPGA coppermine-processor.
I'm thinking about a cheap upgrade so a new Celeron or a P III would be OK, but I might switch to an AMD-system, because it would be easier and cheaper to upgrade later (although I'd need a new mobo and stuff).
there is no Celeon 1333 MHz, and probabely never would be. Right now the fastest Celeron you can get is 1.3 GHz with 100 MHz FSB, but your board wont take it since it is made with a new core and needs a different chipset support with the 815E/EP B0 step or i815EG or VIA 694T or SiS630T etc.
The fastest Celeron you can put i your system is 1.1 GHz which has the same old core and can work with your current motherboard.
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The two most popular KT266a motherboards seem to be the Abit KR7a and the Asus A7v266-E. I'd recommend one of those. What brand of motherboard do you have right now? If you're happy with the brand, you could always stick with it.
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Don't step in the sarcasm!
Seems OK to me but it seems like you want to do some video work so you might want to look at a cheapish dual monitor card from Matrox(G450/550) to replace the graphics card with-they can be more useful than a more expensive gaming card and have good RAMDAC spec for DVD playback etc-maybe spend your money on a better soundcard instead?