smartcookie: Chasidim are very insistent on yichus when it comes to shidduchim. Unless joining a chasidishe kehilah that has baalei teshuvah (such as Rabbi Weinbergers community, Boston in Boston etc), its something to look into. Differing backgrounds can really be challenged at the shidduchim stage in chasidishe circles.
The old line always was, Chasidim look for yichis in a shidduch and hidur in an Esrug, while Yeshivish people seek hidur in a shidduch and yichus in an Esrug (that other fruits havnt been mixed in etc) .