That pretty much duplicates the setup I described. I used that setup until I found a used studio power pack setup. BTW calumet is selling just that right now and it's a "steel" at $750. They have some older 3000 wattsecend power packs bundled with a pair of lampheads for $750.
If those are even "effective wattseconds," I'd stay way from it unless I was lighting large groups outside- in which case I'd jump on it. My 1000WS pack and head system can only go to 1/3rd power, and it's waaaay too much power for a small studio or location portraits, especially if you want to be able to do low key shots. Even with scrims and modifiers, it's a real pain to get control of the light- better to get a single smaller light and use reflectors if you have to, or flash guns.
The problem with too much light is that the easiest way to dim the light is to move it back- but that creates a "point source" that is harsher than you usually want the light to be dimmer for- so it's a catch-22 unless you can adjust the lighting levels down, but in a pack and head system, you're not drawing load off the caps, and I'd be concerned long-term about that (which is why my pack requires one non-adjustable light head to be connected at all times.)
I'd much rather have closer (softer) lower-powered lights, even when I do high-key if I have the choice. It's all about control of the light, and it's difficult to control a lot of power without turning the lights into harsh point sources unless for 3k you have around 8+ stops of adjustability.
YMMV