The Hague 360 (which is basically a Bescor MP-360 head I believe) is definitely one of the cheaper options.

It's relatively smooth if you use a lightweight camera and wide angle lenses, but a little less so for more telephoto shots. One thing to be aware of is that the tilt range is rather limited (15 degrees either way, up/down).

It's also not directly programmable, so you can't really do timed/programmed moves with it like the Kessler stuff (although I'd imagine it's possible to build some kind of add-on that replaces the remote control to do something like this).

ServoCity also sells some lower end pan/tilt heads, such as the PT-785 ($349) and MPT-1100 ($649): https://www.servocity.com/html/pt785-s_pan___tilt_system.html https://www.servocity.com/html/mpt1100-ss_pan___tilt_system.htm

Both have 6 lb. capacities so similar to the Bescor, although they are priced a bit higher.

I don't really have any experience using the ServoCity heads though, so I'm not sure how they compare in terms of smoothness and performance.