For a new bike, unless you are going to get a super light carbon bike, don't overlook the new aluminum bikes. Some are under 18.5 pounds and you will be able to get a better component group. Tiagra for certain, maybe even 105. Not an SRAM user, so I don't know if options open for it's component lines.

Old bikes are good. I ride a 27 year old bike and 39 year old bike that I put new components on. It didn't save me much money if any by upgrading them, but I get what I want out of it.

edit:
oh.... never mind, you said "carbon fork", not carbon bike. So half my post definitely does not apply.