For those looking for a broad yet deep introduction to genetics in a single book, "Genetics: From Genes To Genomes" delivers on both accounts. Hartwell, Hood et. al. are well known authorities in the field, and you'll be hard pressed to find another textbook at this level of content value in the foreseeable future.
Unfortunately, good things seldom come cheap--as you've undoubtedly noticed by the three digits to the left of the decimal point--but short of actually enrolling in molecular biology curriculum, you'll be well served by this book, and I wholly recommend it.