What is my XYZ worth? How much is THIS worth? Value my...

I think you meant to reply to coventry_eagle, I was just answering farewell, but no odds.

Firstly I hope you came off better than the fork.

Any conscientious buyer will be concerned that an incident that has snapped the fork, will have damaged the frame: you'll need to demonstrate that the undersides of the top and down tubes don't have a characteristic "ripple" (where the head tube has bent back), nor that the paint has cracked there.

853 has thin walls in the middle of the tubes, so any rust there will also be a concern: you need to rub it back to see how deep the corrosion is. The rearmost cable guide for the back brake also looks to have some corrosion which needs to be detailed.

There appear to be some patches of tape on the frame: most likely they are to prevent cable rub, but they want to come off too and the frame washed, lest the tape or grime are concealing something sinister..

Either way, I'd strip the frame (which will allow you to clean and check it thoroughly) and sell i) frame and headset, ii) wheelset, iii) groupset (including bottom bracket and cassette) and iv) finishing kit. If the frame is below par, this will drag down the price of the other parts.

You should be clear about what happened, what you've checked (and how) and what you've found.

There are plenty of spokes in the front wheel so it's quite possible it survived unscathed. Equally, the forks could have acted as a sacrificial part and by snapping, saved the frame from damage.