This looks pretty neat. I think that, even if not in the long term, for a launch like this, HN people will want to see the more visible "free" option to better evaluate your offering.

Having that more prominent, even if it's just from detecting the HN referrer, will eliminate a lot of noise.

The "Try It" option is good and may make up a bit for it, but I still think it would be good to have a nice, initial free offering.