Sonus faber Cremona M with Prima Luna DiaLogue One

I currently own a Prima Luna DiaLogue One integrated amplifier (around 38 watts in ultra-linear mode with EL-34 tubes) driving a pair of Sonus faber Toy Towers (8 ohms, 89db/2.83v). I ended up replacing the stock EL-34's with Gold Lion KT-88's (Russian re-issue), which added quite a bit of power and control, and I have to say that I love the combination.

Source is an Oppo 95, a Squeezebox Touch, and a Pro-Ject RPM 5.1SE. Cables are mostly Nordost (Brahma and Vishnu power cord, Heimdall and Red Dawn LS interconnects, plus Audioquest speaker cable).

I am contemplating upgrading to the Sonus faber Cremona M floorstander, which I always loved and was never able to afford, until now. These are 4 ohm and 91db/2.83V, and, to my eyes, one of the most beautiful speakers I've seen, regardless of price.

I spoke to Kevin Deal at Upscale Audio, among other people with experience when it comes to both Sonus faber and Prima Luna, and everybody assures me that the combination should not be a problem at all. My room is small (second bedroom in a 1500 sq/feet condo) and my listening preferences include classical/jazz (mostly orchestral, but also love violin/string concertos) and lots of soundtracks (big Ennio Morricone fan), but I also love hard/progressive rock (anything from Deep Purple/Yes to Iron Maiden and contemporary doom metal and things like Mogwai). In other words: eclectic.

Do you think it'd be wise of me to upgrade the speakers? I love the Prima Luna and would not really like to "upgrade" that as well. Not to mention, I do not want to incur in an additional cost if I end up spending thousands for the Cremonas...

Some people even mentioned that the Cremonas should be easier to drive than the Toy Towers, but I do not fully understand the reasoning behind this.

Any users with a similar combination of speaker/amp?Any advice and feedback is appreciated.