IF you can't find some good reading on the newsstand this week, you're just not looking hard We can't imagine there's one New Yorker who won't be attracted by the cover lines "Envy" and "Stress," (the two perennial conditions that most of us suffer) in New York magazine and Newsweek, respectively. As we head into yet another summer that will inevitably be filled with stories of excesses in the Hamptons, it is hard not to feel envy. New York magazine points out that more than ever, Manhattan has become a home for the have-a-lots and the have-nots, and never has the gulf between the two been as wide. The problem with the four-story package is the repetition. The only other feature in the magazine, on rock band Pavement, is unreadable if you are not already a fan. Newsweek's stress package is more compelling. It takes a look at the causes of stress, our bodies' reactions, and innovative ways to reduce stress. Newsweek's been bulking up its coverage of Wall Street and business and the results are good. This week's issue features an essay on why full-service brokers will not be killed off by the Internet, plus an excellent feature on Silicon Valley moguls, and an exclusive interview with Microsoft's Nathan Myhrvold, currently on a one-year sabbatical. On the international front, Newsweek weighs in with its analysis on how the deal to make peace in Kosovo was achieved. Time, on the other hand, publishes the fifth of its special "People of the Century...