Hello Stan,
I have 1 Alien Bees 800 and 2 White Lightning Ultras. They are all made by Paul Buff, have similar if not identical features, and take the same accessories. The WL's are over 20 years old and work just fine. Build quality is better on the WL's (metal vs Plastic) and come with longer warranty period. Of course they cost more.
I prefer the WL's in the studio for their heavier weight and balance with large softboxes however I do take them on location. I do like the Bee's unit better for location because of it's light weight and compact size.
If you want an inexpensive 2 light set up that works well, has accessories readily available and good customer service at a reasonable price, I would consider the Alien Bees.
For recommendations on specific models I would probably consider getting 1 Alien Bees 800 and 1 Bees 1600 for some extra power when you need it.
The Vagabond Battery Pack has 2 versions, single and dual power inverter. I have the dual inverter model. Both use the same battery but the dual has two outlets for seperate lamps and has a faster recycling time. I believe you can use a powerstrip cord with the single inverter model if you want to run two lights on a cheaper budget. Keep in mind that batteries weigh about 16 lbs for the single and 18.5 for the dual. The above lighting setup with the dual inverter should run you about $1200.00 or so delivered to your door.
Customer service has been very good. The folks at Paul Buff are very friendly so if you are interested in Bees or WL's they are happy to answer all your questions. They do have some packages and you may be able to negotiate a discount when buying multiple items. There phone number is 1-800-443-5542.
By the way, Here is a link to another battery pack that has been on the market for a few years. It's made by a company called Tronix. They did a review using it to power elinchrome lamps.
http://www.robgalbraith.com/bins/content_page.asp?cid=7-7883-7908
Hope this helps.
Dan Maust