You might also want to consider the fact that modding using FS2O is most of the time a highly annoying and retarded process.
You have to work with a crappy mission editor, a very crappy model conversion tool as well as nonexisting tolerance for mistakes of any kind combined with a crappy lack of useful error messages and a lack of or just poor documentation.
I beg to differ in some points.
FRED isn't a crappy mission editor. It's a powerful tool, once you get used to it ( this
might take time...).
With the clever usage of SEXPs you can circumvent some of the limitations of the engine.
By crappy modelconversion tool you mean PCS2? Yes, some versions aren't very stable, but the latest versions produce good results,
and it should be recommended to use the .DAE export/ import anyway.
The SCP works on the error messages, just compare the builds from 3.6.9 to 3.6.12.
Documentation: Yeah, that's a big one. In most cases the Wiki can help, but not in all.
Of course that's not what you were asking about, but it seems irresponsible not to mention. 
And no, I'm not attacking anyone here so spare the flames.
No flames, just my opinion
