[AdmiralAsshat]

Doomsday/jDoom was what I used the last time I tried to play it about five years ago. It modernizes the engine a bit so you can have modern niceties such as WASD movement and mouselook.

It even had an option to replace the sprites with 3D models, but I found I much preferred the sprites.

[nailer]

100% agreed. use the Doom high res texture pack for higher resolution walls and floors, but keep the sprite monsters - the 3D ones have a different art style.

[rangibaby]

High res textures really fall into the uncanny valley for me. The original low resolution textures let your brain fill in the gaps, and it's pretty good at that.