This will probably be a strange reply compared to the other ones you're bound to get, but:
many years ago I had a LD MK IV SE paired with a Grado RS-2, and I thought it was awesome. I had nothing to fault with the combo, or the amp itself. Eventually, with enough extra funds (and from reading on the forums here), I sold the LD MK IV SE, and got a Woo Audio 6.
Long story short, I was very depressed with the decision. No matter how I tried to focus, or swapped out tubes, I couldn't find anything superior to the WA6 over the LD MK IV SE.
So I sold the WA6, bought a Gilmore Lite instead, and used the leftover funds in the future to buy an incredible 2.0 speaker setup.
What I'm trying to say is that I think it's worth pursuing the LD MK IV, even if it's not the SE version.