Ahhh... I love my pencils too... You should join us over in the Prismacolor thread! We love talking about pencils over there - all kinds, not just Prismas! Don't feel like you have to read all 76 pages, though - just jump in... we're nice, and we won't make fun of you if you love the way new pencils smell...
Something that helps me with choosing colors is to find a photo online - here are a billion red roses to choose from...
Google images: red rose
Also, I have a "color picker" tool on my computer that was a free download, and I love it:
ColorSchemer | Free screen color picker from ColorSchemer
The tool allows me to hover over any image on my screen and 'pick' the exact color of any pixel in the image. It's a huge help for matching colors and picking out pencils.
If you have a way to post something you've colored that doesn't look quite right, I'd be happy to take a look and give you some ideas...! Hope this helps a little.