I've got a Z77X-UD3H, and I absolutely love it! It's a really good board, but compared to what I payed for it $225 seems a little steep. I don't really use the added features, but I went for the UD3H because the price difference here was around 5 Euro, so it was hard to justify saving 5 Euro.
Looking at the D3H though, it seems fine. Doesn't seem like much of a sacrifice. $37 is a new game on a slight discount or almost 8GB of decent DDR3 ram.
Either way you go, you won't regret it though, I can tell you that much!