Final Doomer has massive variety as it has multiple classes with totally unique weapons. What I highly, HIGHLY recommend is this setup: Final Doomer + Compendium + Shades of Doom + Vanilla Essence. Below is my setup, ignore the 'blankforlauncher4' and 'mapsofchaos'. The zips with number prefixes are all part of Shades of Doom.
What this setup gives you is:
9 unique weapon sets from Final Doomer
54 (!!) megawads to choose from a hub map
Hotkey toggle to go to software rendering, no mlook, low res etc with Vanilla Essence. Perfect for classic megawads.
Unique monster sets for each megawad. There is a menu option for Shades of Doom that locks the current monster replacements (you can have it 100% random for each map if you prefer). This means you can lock it on map01 and keep the same monsters for the whole megawad. When you finish it/get bored you can turn off the lock and get a fresh set of monsters and then jump into a new megawad.
I seriously love this weapon mod setup, the variety you get from changing to a different megawad with different weapons and monsters is massive. There are so many combinations, including using and not using Vanilla Essence, that make it feel like a different game. I'll make a thread about this sometime because I really love this setup. Same goes for Doom Launcher. I can explain my 'blank4launcher' in that thread too.