This is too tough to just pick 3 makers but these would be my top three at the moment of the custom companies and off the shelf companies (no particular order)
Custom companies:
Aldred – like the shapes and quality of the bats that have been appearing on here of late.
Hell4Leather – Like the branding and the profiles in the range also the good things people have been putting on here about their experiences.
SAF – Andy has some very technical principals behind his bats with the offset edges, CtoV profiles etc... I think I would be there all day discussing the technical side and what shape would work best.
Off the shelf companies:
M&H - Distinction & Master specifically – I have had many M&H bats including Julian Millichamp made ones from the early 90s so these would pretty much complete the set of shapes for me.
G&M F2 Octane/Icon, never owned a G&M, also would be interested to see if there is any substance to the flat face trend, also not recently owned a non-handmade bat. I have only seen one F2 bat in the wild and guy using it was out first ball LBW!
Salix - always look top notch and branding looks classy but not had a hit with one.
Honourable mentions for the ones that didn't quite make my final 3 but, I always flit between any of the ones mentioned above and the following (in no particular order): Black Cat, Affinity, Chase, Bull Dog, Charlie French, Hawk, Choice & Rob Pack.