Favorite Brand of Acrylic Paint?

[Naamah]

For reference, Liquitex Basics HAVE gone bad for me, getting all clumpy.  The professional grade never has.  It is very much worth the price jump.  Golden, Grumbacher, Windsor and Newton, are all good, too.

I prefer Liquitex soft body but for some reason Michaels has stopped stocking it, so I use their tube paints and water them down.

[Shaiyeh]

I'd say stay away for in-tube canvas-painting acrylics, those tend to get very plasticky, tacky and streaky IMO, and work best on what they're intended for: paintings.
I use Vallejo and Citadel paints, and same brand paint thinner media+water for my customs, and sometimes a bit of americana acrylics, but those, I'm phasing out for better paints (again, vallejo/citadel). I really like the vallejo high gloss varnish (paint varnish, not spray) for eyes, too.

[vampyrefay]

I really like the Folks brand, I've had one bottle that I barley use that about 3yr old and its still wonderful and works perfectly!