Upload & Sell: On
That's a tough one. Your estimate of "$950-1100" agrees very well with current Lens$db prices for this lens in [E] to [M-] condition. The dented filter ring puts your lens in uncertain territory.
For [E] condition, you would expect some indications of wear on the lens body, and no marks on the glass. It sounds like your lens fits the [E] or better category, except for the doink. Of course, the doink suggests possible problems with optical alignment, and etc.
I suggest you have two options:
(i) sell it in its current condition, with a full description of the situation, plus crisp photos of its good and bad aspects, or
(ii) get the filter ring repaired, and then sell it as above (mentioning the repair).
I've done both approaches. Which one to take depends on the value of the lens and the expected cost of repairs. In this case, I think you're better off with the first case.
I expect you could list it on eBay for a minumum bid of $650 and BuyItNow of $900, provided that you offered 'no questions within 7 days' return for refund of original purchase price and shipping (not including return shipping costs). If $650 to $850 is too little for you, then you could get an estimate for the repair, and go from there.
Good luck and Merry Christmas.