The Liquitex Heavy Body Acrylics that you mention are a very good brand, so yes, I can definitely recommend them for both beginners and professionals. Liquitex is one of my favorite brands of acrylics and I use them often to create my acrylic paintings.

My other favorite brand of acrylics is Golden, which is one of the brands that you mentioned. I use Golden brand and Liquitex brand acrylic paints almost exclusively. Both brands of acrylics have excellent consistency and coverage.

Winsor & Newton also makes good, artist quality acrylic paints. I have a tube or two of the Winsor & Newton Artists' Acrylics and I've found them to be of good, reliable quality as well.

Winsor & Newton also creates a more fluid Galeria line of acrylics, as you mentioned. I haven't tried this range myself, because they are thinner and I generally prefer thicker acrylics. They are listed as professional quality paints, however, so you might consider trying them.

Grumbacher is a student quality paint, which typically contain less pigment and more binder. To be honest I once bought a tube of Grumbacher Academy Acrylic Paint in Alizarin Crimson at the university art store when I was a student and needed crimson for a class, and it doesn't compare to Liquitex or Golden. However, it gets great reviews on Blick, which probably makes it a good option for beginners on a budget.

If you want to use Artists' Quality paint, but can't afford Golden or Liquitex, I'd recommend Blick Artists' Acrylics which has some colors as cheap as $3.25 a tube.

If that's still above your budget or, as a beginner, you think you'll be fine with Students' Quality paint, you can try Liquitex Basics Acrylic Colors or the aforementioned Grumbacher Academy Acrylics, both of which get great reviews on Blick.