If you're intending to write country.... as it kinda sounds like it might be.... midi isn't the way to go. However, for many other kinds of music midi, with good sample libraries works well...
But like Bitflipper said, creativity wins the day over fancy and multiple libraries. You'll find that the better the library and samples, the more it will cost. People tend to accumulate quite a few low cost libraries as a result.... Kontakt is one of the lower cost "professional quality" libraries.
Regarding the 4 samples you provided..... none of them really hit the mark in my opinion..... but of them all, 3 sounded the most open and natural.