SH5 can be a lot of fun too. Just be sure and read up on all the pitfalls involved before you attempt to apply mods. THEBERBSTER especially can be helpful over there, so follow the links in his signature:
SH5 <> TUTORIALS <>HOW TO DO IT <> INFORMATION <> DOWNLOAD LINKS
...which is very similar to his SH4 link. That definitely got me going in the right direction with it. Nothing can help a player get up and down the ladders in the game though, which is still a major frustration for me...