Blacks have a sale on their stoves currently. The 2-burner Camping Gaz version which takes a hose from your big calor bottle is going for about £25 down from £70.
In my opinion for overlanding everything should be multifunctional like a leatherman or Swizz army knife...
For weekends the small jobbies will do, but if you plan on going overland it might be wise to consider the big calor gas bottle and various equipment (stove, lights, heater, fire lighter) can all run off it... And if you're going to camp for more than a weekend, a single burner will just not be up to it...
Well, my 2pce worth..