Integrated Headset-Fork Options

I have a cervelo p3 with the integrated headset. I was wondering-if I was to upgrade the stock fork that came with it, can I use any 1" threadless fork, or am I confined to using a special type of fork for integrated headsets? Thanks for the help

Ben

bump
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you can use anything with a 1" steerer tube. Make sure the fork rake matches the original.

How do you define “upgrade”? I thought the P3 came with a pretty nice fork.