REI just updated this tent to be lighter and taller. Read more details below. Last year's version may be on sale for $30-40 less.
If weight is a low concern, the Half Dome is by far the most comfortable tent for the money. It has a spacious interior and very thoughtful design. It's comfortable and has excellent ventilation and interior storage. It has four kick-stand vents at the top, two large vestibules, and is incredibly roomy for two. It stood up well to wet weather but did not come with enough guy lines to keep the fly off of the inner tent, causing some moisture to get in. The Half Dome 2 Plus' stakes are low quality (although this is a $10 fix) and the tent did not come with enough for each guy point, which made it more susceptible to bad weather. If you don't need the extra space and want to save $20, consider it's sibling the Half Dome 2.
If you want something lighter and are willing to pay more, check out the Quarter Dome 2, which weighs three pounds and five ounces, packs smaller, and is still fairly livable. At $349, compared to the Half Dome's $229 price tag, the Quarter Dome has a 40-inch peak height with almost 29 square feet of floor space. Campers and backpackers with a tendency to count ounces may want to check out this sister tent from REI.