Complicated alright Andy, and expensive
EQ6 is considered a good starter mount (NEQ is simply New EQ) and has a carrying capacity of about 17 kgs (excluding counterweights). Before you say that's a lot, consider the weight of the scope, guidescope, cameras etc. EQ5 is ok, but has a smaller payload capacity and is not as future proof as an
Eq6. Forget EQ3 unless you are interested in visual only.
Most mounts accept Vixen style saddles, otherwise you can get adapters for them if your scope has a different saddle.
There should be a few EQ6 coming up as I think a few people have placed an order for the new Meade LX mounts.
Cheers, Bo