I tried out this mod today after reading about it in this year's Cacowards and it's pretty good.

As the title says I'm just wondering what WADs and Maps would go well with this.

Consolation Prize: PSX/N64
Silent Hill 5to2 (Midwich Elementary)
Chainworm Kommando
Abscission
Stickney Installation
Hellbound
Going Down Turbo
Revolution!

This video shows off a few more mods that can add to the experience, plus a few more links for the aforementioned maps, and a few extra monster packs.