Hello all! Obviously new to the forum, I'll introduce myself a bit. I am an amateur photographer currently living in New Llano, Louisiana. My husband and I will be moving to Washington State within a few months. We are looking to get a little extra income in order to help improve our credit and buy our first house. Since I am a stay-at-home-mother, I was hoping to try and use my photography skills to help.
I have a love of macro photography, and I am hoping to sell prints as well as contribute to microstock websites. I have no formal training, and no experience with a DSLR. Point and shoot only. My last camera was a Nikon CoolPix L810, however I am almost certain it was defective and it left a sour taste in my memory. (Shutter button would only work with $50 rechargeable batteries, for about 7 shots, and only if the batteries were fresh out of the charger.) Anyway, I would like to avoid that particular model. I am looking for a camera that does well with macro photography (1cm or less) but can handle a bit of landscape, seeing as how I'll soon be living at the base of Mount Rainier. I would like to be able to have the largest prints made that I possibly can. My best and favorite camera was a Canon Powershot SX120 IS that I killed a few years ago. I had beautiful success with 12x20" prints, but I would like to go a little larger if possible. I understand that the absolute best way to go for macro is a DSLR, but I will try and work my way up to that. For now, here is the rundown.
I am looking for a camera that:
is 1cm or less macro capable
has at least 16 megapixels (however, as I am still learning, I am not sure that more is necessarily better for larger prints? Advice in this would be great *

can handle a little landscape photography
is RAW capable
is under $500
The two cameras I have been looking closely at are the Nikon CoolPix L620 and the Canon Powershot SX170. Those seem to be the closest I can find to what I'm looking for, but neither have all the specs I was hoping for, so any suggestions and advice will be much appreciated. Thanks, everyone!