Knowing what your objection is to the results you're getting from hot lights might help people make recommendations.
Light modifiers are as important as the head, beauty dishes, reflectors, barn doors, honeycomb grids to narrow angles and cut spill. Be sure you have the options you want available for the heads you get, or that you can make them or adapt them for yourself. Are you going to cut the output dramatically with a big, heavily diffused light box, or shoot with a narrow angle shiny parabolic reflector?
It might also help to know what you're using for cameras, and what magnification ranges you're normally using. Shooting near macro with an 8x10 and large DOF might elicit different recommendations than shooting portraits with 35mm and a fast short tele.
I'd recommend something that has good control of light output over a wide range of settings. Modeling lights with sufficient output for your needs and wired to mirror changing output from the head can also be handy, especially for beginners in multiple light setups.
Are you shooting B&W or color? You can easily use different makes with B&W when you add on later, mixing a less expensive starting kit with higher end stuff later on when you find you need it, but if color is critical, you might want to stay with the same brand for more consistent color output from the combined flash heads.
Tell us a bit more about what you're after.
Lee