Hi Matt,
Few points here.
1. Most importantly try and get out of the habit of shooting Jpegs. Shoot in 'RAW', convert the files to 'tiff's' using photoshop and edit them. Jpegs are distructive so everytime you click save you lose information until finally your shots start clouding and look like how dark colours appear on some HDtv's. Once all editing is done you can convert the shots to Jpegs.
2. Adobe RGB has a larger colour spectrum than Standard RGB (or so I'm led to believe). I always shoot in Adobe RGB.
3. Sharpening if needed should be done outside of the camera where possible. I prefer a technique called LAB Colour Sharpening. It's fairly simple and can be done in photoshop you should google it. Though obviously if you can get the shots sharp first tme it saves you as job later on.
