The Goal Line Defense story I put up, which doesn't qualify, contains a similar subplot. I had that Sega Dreamcast system and wanted nothing to do with anything by Sony. I never ended up with a Sony system until I got a PS1 as a gift a few months after graduating college.

The best part of this entry is that most everybody can relate, as seen above. Just about anyone who reads this could tell you about a time when they dismissed a video game system by a certain company (Coleco, Sega, whoever) only to end up playing it and falling in love with it.