At that price range, just get a CM0064 or CM0264 300ohm in 75ohm out preamp and kill a couple of birds with one throw.
Doing so just pushes the problem elsewhere. The CM Spartan 3 models
are fundamentally a 75-ohm input design, so we don't sidestep balun
loss. Model versions with a 300-ohm input(s) have 4:1 internal baluns
to match the incoming line impedance. Actually IIRC every 300-input
preamp I've ever seen has had an input balun.
Nothing fundamentally wrong with doing so other than having to deal
with 300-ohm twin lead -- if you can still find it around these days.
And there is the path routing consideration for twin lead of maintaining
a distance between it and metallic objects. Not that we're going any
appreciable distance with twin lead but it is a bit of a pain to deal
with and in terms of durability it just doesn't have the physical
ruggedness of coax which is a maintenance issue.