Alien Bees will give you studio lighting on the go if you invest in their proprietary Vagabond system. If you are tech-savvy you can make your own pure-sine wave converter, but it ends up being about the same price in the long run.
Photogenic Studiomax III: Another option is the photogenic bottom line strobe's AC/DC version which is about $100 more than the AC version. You can hook up jackrabbits or Quantum turbos and shoot like crazy. The main advantage is that this kit is smaller and lighter than the Alien Bees.
Hensel Porty Kit: Without a doubt this kit will put out the most and best quality light, but it is VERY slow and even MORE EXPENSIVE than what you would want. The recycle times are painfully slow at 6+ seconds.
JTL Mobilites: This is not a good kit in my opinion but the price is definitely right to perhaps make it worth buying in a pinch.
Dyna-Lite Uni400: Another AC/DC unit that is VERY well known.
There are a few others. The advantage is that you can shoot on battery or AC power, but beware of the trade offs. You pay for this advantage, and you loose a lot of the assets that make studio strobes worth it. Very few units allow you to have the modeling light when you are on battery power. The recycle times are horrible. Most of all, you suck battery power like crazy and get a limited shooting time with these units.
This is why I highly recommend getting a location kit and a studio kit. A Qflash will give you a days worth of shooting on a battery. Lumedynes can customize their set up to give you incredible location shooting with almost any power configuration. The Norman kits are workhorse flashes that can take incredible abuse with a LOT of power. Even a really good flashgun system with the new off camera systems (like the Nikon CLS system) are often really adequate solutions.
Especially since you are going to loose the advantages of power, recycle time, and modeling lights-- it hardly makes sense to lug about all that equipment.