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Oh, and here's all of the above mentioned brushes.
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From left to right: Thäter, Omega, L'Occitane, Frank.

Thäter two band. Can't be beat.

However, if your idea if low cost is like mine then an Omega " the professional" is great. Can't remember if it is the 10095 or the 10098. A quick Amazon search for...

Yes. There is a huge difference in brushes.
Knot loft.
Knot size.
Bristle type; synthetic, boar, badger (and mutliple grades of badger).
And that's just the basic stuff. I'm too lazy to link from...