When I was considering a new LS, I wanted a BH, but the LS unit for the 4xxx series I was looking at looked like it belonged on the 3xxx series tractors... I ended up in a used MF instead, but I got a used Bradco backhoe for it, which was much more cost effective than buying any new BH. I had to make the mounting system, but for most newer tractors, Bradco has mounting systems. If they have one for your tractor, buying a used Bradco backhoe becomes an option. Most of them use the same mounting pattern between the BH and the mounts, even between skid steer and tractor units.
It's an idea if the price of a new LS BH is a bit tough to take.
FWIW, I was quoted ~$7k for a Ansung BH (labelled Branson) through the local dealer. The LS dealer wanted $6500 for their backhoe. Normal dealer markup is about 20%, so figure you might be able to get them to come down 10% from the initial quote...