I hate when this happens ......

...sorry my bad typing as they were ; NOT the XL version.  

It happens all the time. When I first started demoing speakers I brought my Mission/Cyrus 782's with me. The day I heard the SF Cremora auditor M I said that's the sound I want but at the time wasn't ready to spend 7K. I kept looking until I heard Dyn C1's. Very similar to the SF but more dynamic with deeper lows with slightly clearer mids IMO. So I bought them. Couple of years went by and when Dyn released the MKII/Signature I bought the sig's without even hearing them (loved the mocca finish which were on some Sapphires). Glad I did because with both the SF and original C1's they sounded best when you turned them way up. The sig's sounded great at mid listening levels and up. I never thought I would ever get rid of them. Then my local dealer picked up the Raidho line. After hearing both the D1 and the D3 I was ruined. It was a sound presentation and quality/clarity like nothing I ever heard. 

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.