Help with domain type selection for authority site

Hi guys!
Im building an authority niched site. I have selected over 500 keywords/phrases/long tails to work with after a deep research. My plan is add more than 150 quality posts to the site.
Now I have the problem of decide the type of domain I will use for this project.

1) Fresh .com, with the main niche kw included, something like aaaniche.com

2) General dropped .com domain from HammerHead Domains, with good metrics, some link backs and spam free. No niche keyword on the domain.

3) Niched .com from GD Auctions, with an age of about 1 year, containing the niche keyword, with some basic spammy linkbacks checks passed (not sure if all is fine on these checks)

I´ll appreciate your input here. Any other recommendation will be appreciated!
Thank you guys!

I always go with fresh domains for anything serious since I don't want a website called "dildoclub.com" when the website is about dwarf clothes.

I prefer 1) Fresh .com, but without keyword on it. In some cases you will need to build your brand base on the domain name. So I would suggest you choose choose the short, memorable and easy to pronounce domain to buy (no need to have the meaning)

I used a generic domain name for my authority site and am loving every seconds of it! If you know how to get old clean domain, go for it.

Thank you guys for the inputs!

fresh is better