With Apple's (NASDAQ: AAPL) $1 trillion market cap, many investors automatically assume it must be overvalued.Don't make that mistake. Even now, with its stock trading near all-time highs, plenty of value remains in Apple's shares. In fact, here are four reasons you may want to consider buying Apple today.Bears often argue that Apple is essentially a hardware company that's destined to see its margins eaten away by the competition.