My list will not include bug fixes, comparability or stability mods. I also won't be including any mods from GUNetwork, because they're all fantastic! But bare bones, can't live without, must-have mods...
1. Roleplayer's Alternate Start
2. More Perks/Traits
3. Just Mods Assorted
4. URWLNV Ultimate Edition v2.0 (the successor to Nevada Skies on ModDB)
5. IWS-Increased Wasteland Spawns (try out the battle in Primm)