Adrian,
There are some really nice looking Macro shots there, but a lot of inconsistent results especially for a list of favourites that long. I know that with a coolpix, just like my Olympus you get shutter lag which can disadvatage you on framing a subject sometimes, but the biggest thing that stood out with your photos for me was the great colours you had in your macro, and then the lack of colour in your wide angle.
I would say work on your wide angle some more, try to get rid of the inconsistency and bring out some colour and get rid of the washed out blues. Make the water a nice rich blue colour and get some sunballs going on, then light your main subject with your strobe to bring out the full colour of the subject within roughly 4ft of you.
Your Macro's are nice, and the WA would be great if they were more colourfull.
Bettering your equipment is an interesting topic round here, some people say you have to have technique to make a good photo, and yet others have proven that when they get a more expensive setup their photos improve leaps and bounds on their own.
If you have the money why not improve your equipment if thats what you want to do, if you're just having fun and want something to test you then i'd say try more things with your WA and improve those images.
my lowely opinion.
Happy Snapping
Giles