front ported speakers with ribbon tweeters?

Not sure what kind of money your talking, but for around $1.5K or less used the Legacy-Audio Classics are front ported, full range floorstanders, that use ribbon tweeters. A lot of speaker at there used prices.

acoustic zen adagios?

All Reimer speakers are front ported and have ribbon tweeters.

I second the AZ Adagio's. Heard them at RMAF and really liked them. They just produced a larger version of that speaker. I don't recall the name.

Also you might want to take a look at salk sound. J Salk design speakers that are front or rear ported. Some of the best wood crafted speakers i've seen in the industry.