BEST REAL-ESTATE APPRECIATION Aventura With all the hype over the forest of condo developments sprouting in downtown Miami, the Design District, and Miami Beach, it's important not to lose sight of reality -- especially if you're one of the many hopefuls mortgaging your future in the name of quick profits. According to a Wall Street Journal study, 2004's greatest real-estate appreciation in the entire Southeast was (drum roll, please) zip code 33180 -- Aventura -- where the median home sale price was $445,500. That's a one-year increase of 23.6 percent and a five-year increase of 112.5 percent. Of course you'd never know this from our local media coverage, in which the decidedly unsexy Aventura finds itself overshadowed by the hype for buzz-laden new projects to its south. Let the buyer beware.