Speaker upgrade for classical music

If you are serious about having a system that could accurately reproduce classical music then you need to start from scratch. That means get a new amp, source etc. The easiest way is to get a one box solution with an integrated amp and a decent streamer. As such you’ll need to first decide on speakers and then pick an appropriate amp. However, it gets more complicated. Classical music encompasses everything from solo instruments to a full scale symphony. It is very difficult if not impossible to get everything to sound accurate and recreate the massive scale of a symphony for less than 50k. This could take years of trial and error to get right. First you need to Read more on this forum, this topic has been discussed to death. 
I listen to classical almost exclusively. Over the last 8 years I’ve had multiple speakers amps etc. Ultimately I ended up with two systems, one powerful system for large scale works and a smaller system for solo piano, violin, trios quartets etc. I couldn’t do it in one system no matter how hard I tried. 
Speaker Recommendations here that worked for me include: Harbeth, Sonus Faber, Vienna acoustics, Totem. A speaker that wasn’t mentioned is Triangle, a horn loaded French speaker. The amps have to be specific to each speaker. 
My current system for symphonic works and concertos : Sonus Faber Elipsa SE  with McIntosh gear MC452 and C2600. 
System for solo instruments and vocal: Diapason adamantes speakers with Mastersound tube amp. A tube amp is absolutely necessary for strings and piano to get right. 
If you can only have one system, My recommendation is harbeth 40.2 speakers with a nice tube amp. I know your stated budget is 8k and I also had a budget of 5k initially. If you can budget 8k on a speaker that usually means you can spend at least twice as much if not more. I got some of my equipment used on audiogon for 50-70% off msrp. So everything is possible. 
Looking at audiogon right now I’d recommend SF elipsa SE, which you can get for around 9k (negotiate) and Audio research integrated Tube amp, GSi 75. It has an awesome DAC, preamp, and phono stage. All in one box. AR is very reputable company. There is one here for 10k, which you can probably get for around 8,5k if negotiate correctly. 
For a source You’ll eventually want a turntable but don’t need to rush into that yet. Get a decent streamer like blue sound node and use a good dac. Send me a private message and I’ll send you samples of my system sound. 

I can echo Magnepans, perhaps 2.7qr's or 1.7i's in front, an MMG center channel, and two wall-mounted surround maggies.  Buy used and your'll have plenty of change left over, and no need to ever upgrade speakers again.

I was looking at these a while back, https://www.aperionaudio.com/products/verus-iii-grand-tower-speaker
Aperion Grand Verus III, reviews are good and you get a free 60 day listening tryout. Nothing to lose there! Enjoy your search, from the description of your gear, you need to upgrade your main speakers.

I listen pretty much only to so called classical’ music from all times periods and genre and can as many have here recommend electrostatic and planners speakers for such music.
However after having owned Harbeths for 10+ years (M30s and then M40.1s) which were fantastic (as most ’BBC inspired’ speakers tend to be for ’natural’ sound). I will throw another make model into the mix that doesn’t get mentioned much but is also a matured classic still being manufactured today.
Which is the Finnish made Gradient ’Revolution’. which is easily within your budget new or used.
I went from the Harbeth M40.1s to active Revolutions around 6 years ago and have had no desire to change speakers since.

Hello from NZ.  My main listening is classical - Earliest is Buxtehude and latest is Pärt.  Piano to Orchestral.  My current speakers are Magico.  They are nice and do classical just fine.  I do not particularly recommend them but to get what you want I think the following need to be taken into account.  First, you can improve your room.  Judicious use of damping materials and experimentation of speaker placement can in effect largen your room.  Second, there is no substitution for cubic inches.  Yes small speaker manufacturers will claim otherwise - but it is difficult to work against the laws of physics.  Third, do not get ported speakers (possibly a type known as Transmission Line).  Once you lose the woolliness of the port you will benefit from a clear and more accurate sound.  This is not without cost as sealed designs tend to require more amplification.
Finally I endorse upgrading the amplification.  I think the amplification and speakers should really be regarded as a unit.  In fact some manufacturers (eg ATC) do exactly that with the 'active' speakers.