gorgeous pics! love the detail and the lighting!
I currently use an olympus E-420 dslr, i tried the nikons and canons out and ended up going with olympus because i love the feel of it, the others had too much plastic and did not seem as durable (i do alot of hiking in the mountains and slips do happen!) but quality wise the nikon is a bit better.
What lens do you use for your macro shots, and settings ect? I have been having a rough time getting mine to focus on the smaller fish with a 14-42mm lens.