The phrase "land o'goshen" is an old-fashioned exclamation used to express surprise or amazement. If you're looking for some synonyms for this phrase, you could try "goodness gracious," "jeez," "holy cow," "wow," or "oh my goodness." All of these expressions convey a sense of astonishment or disbelief. If you're trying to emphasize your surprise even more, you could go for something like "blimey," "crikey," or "gosh darn it." Of course, the specific phrase you choose will depend on your personal style and the situation you're in, but any of these options could work as a substitute for "land o'goshen".