I would definately recommend some sound mods.
I currently use all of finiteless stand alone sound mods, although LoBlo has recently released a sound mod of his own that I need to check out.
The most easy ones to recommend are finiteless Ambient sound mods, which simply change the menu and in-game music to something that I personally find a bit trippy but very easy to listen to for hours on end.
I think his vision for the mod was something like the sounds one would hear inside a submarine if one were really drunk.
I hope you enjoy LWAMI!
Cheers,
David