one of the most popular mods is SS(stainless steel), it comes in 2 parts because there alot of info on it, so make sure you hav lots of free space on your computer, i alos recommend getting the 6.1 patch 4 it after installation,
anyway ive found tht money is alot tighter on this game, even though you could edit tht, but if u want a challange there nothing like not being able 2 afford an army lol, ummm id say the comp on it r stronger, they expand quick as there r more settlements on the game map aswell as new factions, challenging enough 4 me, havent got a link but should b easy 4 u 2 find, SS is pretty much an over haul of MTW2, its a vast game and a good mod if you hav a good computer 2 run it!