I've worked on many audio tours and promotional videos where voiceover was the key element. Your recording sounds good, and should only need a little bit of tweaking to sound great. The main improvement that can be made is to reduce the sibilances ("s" sounds) a little, and i'm sure an eq could be set to enhance the qualities of your voice.
Because my expertise is with Pro Tools, i would give you settings for that. A free version of Pro Tools is available, called Pro Tools First. If you're interested, have a look at it and see if it's something you'd be comfortable using. It's very versatile, once you get used to the main controls.