If you like Diablo for PC, then you'll probably like Dungeon Explorer: Warrior of Ancient Arts. It's similar to Diablo in playing style, and the graphics could be considered damn close.
Master of the Monster Lair isn't exactly a dungeon crawler, per se, as you make the one dungeon you explore for the whole game, but it's considered a dungeon crawler.
If you need a first person fix, try Fighting Fantasy: The Warlock of Firetop Mountain. It's a great little game that at first glance appears to be very similar to The Elder Scrolls, but is more of a dungeon crawler than an awesome world of awesome. Kind of lackluster, though, and the graphics aren't exactly top notch.
There's also The Dark Spire, which is a throwback to those old first person adventures on the older systems/computers. I didn't really like it, but it IS a nice looking little dungeon crawler if I ever saw one.
There's also Soma Bringer and Phantasy Star Zero, as others have already said.