I hate when this happens ......

This should be expected whenever the audiophile goes to dealerships or shows. There are hundreds of superb sounding systems out there. Some will connect better than the one we are currently using. 

You have a choice; either put more money and time into redoing your rig, or buy the speakers. But, there is no guarantee those speakers will sound better with your gear. The shop has optimized the system, whereas unless you buy the entire rig you will have to go through the same process via a different route. 

Frankly, the considered change looks to me more like a sideways move than a big step up. You will lose some attributes of the SF in the process, and you may regret it. Both are very nice speakers, but you may wish to redo your electronics and cables to achieve better results. My guess is you haven't come close to maximizing the speaker you currently own. 

Its just a new flavor which too will be tiresome ....you will then like your Sonus speakers until you tire of them....then.....its a vicious circle.

You financed speakers!  Unless you got a special zero interest deal, which speaker twiddled your sonic interest wouldn't be a priority concern for me, financial planning would.

douglas + 2
You can bet on it that what you hear in a salon will not sound the same in your room. The Marantz Reference SACD player I auditioned sounds so much better in my room than in the showroom. It gave hints to it's potential but it's in my system that it struts it's stuff. It impressed me so much that I got the matching integrated and couldn't be happier.

As for speakers, you can get a good idea of how it will sound at your place but you should be able to take a pair home and hear for yourself.

All the best,
Nonoise