I tried many under 100 bucks, some were not at all suitable, with 1st & second string being so very loud because they are both all "steel" strings, the other strings are bronze wound, bronze is "NOT" magnetic & magnetic pick ups cannot "fully" see the small steel wire inside the bronze windings. So 1st & 2nd strings really boom out and are awkward to use in chord shapes, with most p'ups under ?100.
The Baggs p'up has adjustable separate pickup poles for each string & is the perfect answer to this problem. It is like a separate volume control for each string. Guitar sounds natural & is far easier to play with this p'up. Do read the enclosed instructions & experiment swapping pole pieces & pole heights.
I assemble my own valve guitar amplifiers. I made a special acoustic valve amp for this reason. I find that valve amps & magnetic pickups go together like a horse & cart, or peaches & cream.
I have, at last, a great sound from acoustic guitar + valve amplifier combination.
I must thank Thomann for helping me find the correct pickup for my acoustic/valve application.