Way less than your proposed budget but figured I'd mention it as it's a guitar I'm really enjoying playing for fingerstyle... Last guitar I bought (a few months ago, secondhand via an eBay auction), and which I had previously been eyeing up, wanting to try for a while, is this:
https://www.amazon.co.uk/Recording-King-RNJ-26-NA-Guitar/dp/B00713TVP4

It also comes in black:
https://www.amazon.co.uk/Recording-King-RNJ-26-BK-Guitar/dp/B0133MO2BY

I'm a big fan of Recording Kings: they do pre-war style guitars exceptionally well.

It is certainly a responsive guitar (i find it very easy to do harmonics and false harmonics and it has plenty of overtones).

All solid woods and a fingerstyle-friendly nice 1 3/4 nut width. It has a very comfortable neck: I don't like super slim necks, find them quite annoying, and this one has a bit of chunkiness to it, but not overly so.


Interesting that you are finding that Martin bland but considering replacing with a Faith, Eastman or Furch. I've played many Faiths, Eastmans and Furches in shops and while I've never played a bad one, I've never played one that I've been blown away by.

I find Faiths generally a bit lacking in bass. I played a nice enough Faith Parlour once, one of its more deluxe models, though again, it didn't really grab me. I'd love to try the newish and rather atypical for Faith, Gibson-ish looking Mars Classic Burst:
https://www.pmtonline.co.uk/faith-mars-frsb-acoustic-guitar-classic-burst?utm_source=google&utm_medium=shopping&gclid=CjwKCAjwlo

Eastmans and Furches have always struck me as very nice guitars, but just a bit polite and well-balanced sounding.

You know the London International Guitar Show is this weekend at Kempton Park in West London? Probably yr best opportunity to try out a shedload of guitars in one place?