Room setting: new amp or new speakers?

I agree with the several posters who advised to fix your room first.  Get a pair of good speaker stands for your Sonus Fabers and get them out into the room a bit.  You'll be surprised by the transformation of your system.  You'll be able to get a soundstage between the speakers and be better immersed by the sound.  Once you know the real potential of your system you can then decide what components to upgrade.  I believe you're correct in stating that your current speakers are better than your amp.  Once set up properly, obtaining new electronics will take your speakers further down the road (because they are capable).

Disagree with speakers first,

you need better electronics  so with a better amplifier you may be happy with the sonus fabers and you would set yourself up to properly power a new pair of loudspeakers  as the next upgrade

Dave and Troy

Audio Intellect NJ

@albymana 

Since you're new to this, you might be best served by an incremental, cost-contained approach that lets you try new stuff yet feel free to dump it if it doesn't work out.

First, your speakers need to be freed from their bookshelf gulag. Set them on decent stands like Monoprice, which will leave change from your $100 bill. Listen to that and see what that does for your room. Change one thing at a time, then listen at length

Next comes a decent amp. Your little Yamaha is okay but not ideal. Get more power than you think you need and high current output which will help your current speakers and might well be required to properly drive your next pair.

Third comes a good sub. All bookshelf speakers need a good sub.

Then the rest will come in its own time. Enjoy! 

+1 devinplomnier and ddgtt 

You should get your speakers out into the room on stands and spend some time finding a good location which optimizes bass performance and imaging. This will make a huge difference, and start you on the right path. Then if you like the sound but find them lacking in bass, consider a sub or 2. 

Depending on your listening levels, you may then find the need for more power.

Good luck, and enjoy!

There are two schools of thinking. Speakers first or Source first. From 30 years experience with different systems there is not only one way to do it. I tried both approaches but I got best results starting with speakers. Matching it to the sound I like and the room I have. 
 

I started upgrading my current system 4 years ago with new speakers after moving in a new home. I just completed the system upgrade this month with a new cartridge. This is the last piece of the puzzle after I upgraded the preamp, amp, turntable and cables in that order. My system in now well balanced. I can now start over again…just kidding!

HiFi Huff on YouTube says that you should invest as much as 50% of your system on speakers. 
good luck and keep us posted on your choices.