First off, ISO 200 is not high, and as Ron said, I don't see any excessive noise/grain either. With respect to the issue of the actual image, I prefer the original as well. Mainly because the vignette tends to focus the eye on a very bright area.
Looking at the original be very careful of your background; in this case it is over-bright to blown with dark shadows, caused by the fact that there's a very bright light source between directly behind the plant. Solutions for this would be to either use a diffuser between the light and the plant, or change your shooting position, or wait for a more appropriate time of day.