I currently own a Nikon Coolpix 4100 digital camera. While it is perfectly fine for taking normal pics, it is severly lacking when taking Macro shots of my 75 gallon tank. I think part of it is not having manual focus but i'm not a camera guy (do plan on taking photography lessons however). I did some looking at Newegg.com (great customer service when I had to return things) and saw some digital SLR cameras. Are the SLR digitals worth the extra money for Macro tank shots? Granted, I don't want to spend $1000 on a camera, but realize I may need to spend more than $200-$300. Help?