Another aspect to consider would be the spl level you listen to.
Adagios really sing at mid to high volumes. In other words they need some spl to really wake up/ come to life etc. (in my experience).
I heard Gibbons a few times:
1. In a store - connected to low powered tube amp - the vocals were to die for - Romantic - exactly - it made me fall in love with the vocals coming out of gibbons (I bought my first tube amp soon after that). But they did not come across as very dynamic speakers for me and I need that quality when I listen to Orchestra and some Jazz.
2. I then Gibbons at HE show connected to Simaudio SS equipment. I think the system was not broken in (but why do people show their equipment without breaking them in first

) - I could not stay in the room for too long. It sounded very HI-FI ish and I would attribute it to the room and cold electronics.
3. I recently heard them in another store, while shopping for a pre-amp. It really lacked authority in the bass department. The base was weak, it was weak enough for me to not buy them as I needed one pair of speaker for all listening types.
Bass - I find Gibbons to have relatively weaker bass, while Adagios really go low but don't have tight bass.
Thiels do justice in the base department, but may not paint organic mids and highs.
I have yet to find a speaker at this price point that did all the three frequencies well.
Although I heard
http://www.lipinskisound.com/ at a store - they were amazingly transparent and emotionally connected at the same time but at HE '07 show they sounded hi-fi ish

.
If you cannot audition, try to find a dealer that keeps both Gibbons and Adagios - if you assure them business they may let you audition both speakers in your home/room.
Gibbons 8 were made for NYC apartments and if you do not listen at high spl, given its limitation - it may just be the right speaker for you at the price point.
Another thing to consider would be a good two way speaker - which is what I am leaning towards as a next step for me.
2-ways tend to have simpler crossover and are generally easier to drive and do things right in top and mids.