It's a matter of taste. I personally love the warm detailed sound of Proac. I borrowed a pair of discoveries and too found them slightly cold / thin but if anything i think accurate is the term i would use. Who cares if a speaker is neutral. I want a forgiving speaker so that i can enjoy the music not the production technique! I found myself trying to voice the Benech with cables, mains conditioners etc but to no avail. I think you either like the sound or you dont. Ive owned D15's, D25's and D38's in my time and can honestly say that the 38 is a speaker for life! Ive actually had the pleasure of hearing the D100's with Gryphon gear. I can quite honestly say this massive hulk of a speaker completely dissapeared from the room, it had an electrostatic presence that quite frankly made each guitar strum going from one end of the room to the other, and made me blink a lot, Awesome! hair standing on the back of the neck material.
Id say that the D25's are fairly unlike the rest of the range though. They are absolutely 'magical' for the money with certain types of music (non-electronic) and in my opinion better the Living Voice OBX range. The D38 is the first Proac step into hi-end, 'we only sell a few of these a year territory' and i reckon they spend ages with each pair. my advice , spend the money on the speaker , not the carbon fibre side cheeks and fancy pants plinth. buy a speaker with true sparkle, the D38.
It will be a long time before you upgrade! Currently running a BOW technologies / Shanling / Proac / JPS system. warm, detailed, and voiced to my liking! and under 10K.
id also say that the current drivers in the newer response range seem much faster. Its the first true range where Proac have had strong input into the development of the drivers.
To sum up listen to both, side by side, blind and choose the most enjoyable speaker!