I favor all dividend growth stock initially (JNJ, PG, KO, PEP, AFL, HAS, PM, BP, WMT, TGT, CHD, etc.) until the dividends grow to 20% Yield on cost. Once you're pulling in $200k in annual dividends, I'd imagine I'd get pretty antsy to start investing (buying) in operating businesses, 130 unit apartment complexes, etc. It's my belief that those high dividend stocks, REITs, bonds, etc. would only slow your passive income down over the long haul because they do not grow at double digits like those listed above. In other words, AFL, which has averaged ~20% dividend growth for the previous 10 years (even startingat 3% yield) will quickly surpass a high yielder paying 15% that doesn't grow or more likely will be cut.
Good luck in reaching your goals in a couple of years.
Jason