The Ranger series is a battery-powered power-supply-plus-head system; the DLite series is a mains-powered monolight (power supply and flash head in one box).
Unless you are doing location shooting and can't depend on mains power being available, the Ranger series is probably the wrong choice. Even if you are concerned about the weight of the DLite units for mounting, a mains-powered pack & head system would be a better choice for use in your own studio or if you can count on AC power being available. Batteries aren't forever, and mains-powered packs will recycle faster.
On the other hand, if you are shooting mostly on location and either need to be very portable or can't count on power being available, then the DLite series won't be of much use to you unless you also have a large generator handy -- a set of Elinchrom monolights can really guzzle down the power. (I always loved their recycle time -- the lights I had could keep up a pretty consistent 2 frames per second at half power.) This is where the Ranger series makes its wages, and it has some significant advantages (as a system) over competitors like Lumedyne and Quantum, where you'd need to mix and match with third-party equipment to get softboxes and other modifiers to work with the flashes. That's nothing against the competition's quality or versatility, it's just an easier task to put together a system with the Rangers.