My introduction to Guilds came via the discovery of a JF30 12-string on my local Craigslist. I had two Taylor jumbo 12-strings at the time, inlcuding a Leo Kottke signature model, but since the Guild was cheap and I didn't know the brand, I decided to go have a look.
I was blown away and bought the guitar. Within a month I'd sold one of my Taylors (I still have the LKSM) and started checking out other Guilds.
Years later I own (or have owned) most of the jumbo 12-string models Guild offered during their Hoboken and Westerly eras. They're the best 12s I've encountered.
Granted, the Taylor necks can't be beat. But the sound, at least to my ears, pales in comparison to Guild jumbos. I just had the Taylor / Kottke out a couple days ago. I don't get my kicks knocking any brands, but it just sounds weak, muzzy in the mid-ranges. I want to like it -- it's a beautiful looking guitar, has aged to a lovely honey color, but -- in a word it just lacks Guild's *authority*.
Whether they're for you, only you can decide.
I'm very fond of my F212XL. Here's one for a good price on Reverb, and it seems to be in good shape.
Reverb is a marketplace bringing together a wide-spanning community to buy, sell, and discuss all things music gear.
reverb.com
Good luck!
Glenn