A Defender will be no cheaper to run than a Disco, but you might have a very unreliable Disco thats costing you a bomb on repairs.
If you bought a Def you just might be buying a new bag of problems.
A lot of LR owners go through the same thing. What seperates the men from the boys is, if your LR is costing you a fortune you can get rid of it, and buy a little Corsa or similar eurobox or stick with what you have and fix it (or buy another and keep on top of it)
My own Disco used to give me tons of cr@p, i have spent over £10k on it and its only worth £1500 at best. madness you say, maybe so but now i have a truck that plays in the mud most weekends and takes me to work & back during the week.
stick with it, it will be worth it in the end.
Regards
wizard