Lemocker,
If you have met someone from a different culture who is a GOOD and PRACTICING MUSLIM, then go for it. I've seen couples of mixed backgrounds who have successful marriages. And in a way, it is exciting for them to learn about each other's culture, so it's more of an adventure. Such a marriage might be a little tougher (due to cultural differences).....but ALL marriages require mutual respect, communication, and efforts to make the relationship work.
Islam doesn't place any restrictions on marrying a good Muslim from a different culture. It boils down to personal preference as well. Some people are more comfortable with a spouse of similar background whereas others don't mind the difference. I personally would prefer similar backgrounds. But more power to those who have the courage to marry outside their culture.