UPGRADE TIME!! Preamp vs. Speakers???


Good day audio nutz!
this could be in Speakers OR preamps category but dont know how to post in both..?

I have one I would like your opinions in cracking...
I am considering upgrading either the speakers from Focal ARIA 948 to the new SOPRA n2 (after a demo) OR
upgrading my Simaudio preamp from 350p to the 740P.
The 2 Sim 400m monoblocs and W4S dac DSD SE  would remain.

My questions:
1. What would be the best "bang for buck"?
2. witch option do YOU think would be most noticeable?

I REALLY LOVE the Sim/ Focal sound so I want to stay in those brands I just want MORE of it..
things to consider I get about a 10% discount on gear
the speakers I would get full trade in cost of $5K
The 350P preamp I would get "most" back in the trade up program (plus 10% discount)

Ok let me have it!
and Thank you!
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I’m using a Simaudio 740i Integrated amplifier with a new pair of Sopra 2 speakers. Previously I had a pair of Focal 1028be2 speakers also using the 740i.
The Simaudio electronics has a very musical smooth sound that matches quite well with Focal Speakers. I’ve heard both models of the Focal speakers using Macintosh, Spectral, Hegal and Naim electronics in addition to my own personal Simaudio 740i amplifier. I think the Macintosh and Simaudio gear is the best match with the Focal sound.
The Macintosh (solid state) seemed a bit more "colored", especially in the bass....the Simaudio was a bit more neutral but both were very musical sounding on the Focal’s.  I could live with either amp but given the choice I'd go with Simaudio.  Haven't heard tubes with either model of the Focal I have owned, but I'd sure like to try some Audio Research Reference gear with the Sopra's.  
I can't address your speakers, but I recently upgraded from a 340i to a 740P + 760A (one), and the difference in noise floor was dramatic, and strangely enough, the external phono stage has much less incoming noise on the 740P vs. the 340i (using the same input type on both).   If anything, the 740P makes the 340i seem like a much worse choice at its price given how much better the 740P sounds in my system.