I now have this precious little beastie living with me:
Her name is Amber. She's about a year and a half old. I adopted her from a woman in NY - she was pregnant and moving back in with her parents, and she couldn't keep the cat at her parents' house. One of my mom's friends knew I was thinking about getting another cat to keep Oliver company, so she told me about Amber.
Oliver is behaving... well, about as well as can be expected. He's hissing and growling, but he's not actively attacking her. She got pissed at him tonight and hissed right back, and he got confused and ran away from her. Oliver is not a smart kitty.
Amber is truly adorable though. She's pretty skittish, and runs when we make sudden movements, but she's also very curious, and likes being petted, to the point where she was headbutting Kevin pretty hard to get him to pay attention to her. All in all, she's adjusting better than I thought she would, after only one day!