Hey! I'm Kat and I've got Astoria Greengrass (from '00) and Emmeline Vance (from '78). Astoria probably won't like much of either (but she will admit Sirius is rather easy on the eyes, and I would totally agree ;))
Emmeline would totally get along with Lisa. She's also a 'Claw and much in to logic and learning. Em, as a prefect, would find Sirius to be a pain, she hates when people goof off and break the rules. I'm sure he'll crawl under her skin a few times :)