I'm going to warn you right from the get go - I have NO earthly idea what I'm doing. None. No, really. Quit my day job and been F/T trading since June 2013. Have more money than I started with. Substantially more. Better lucky than good? Guess so.
I am breaking all the diversification rules right now by keeping almost 90% of my money in AIG. I used to hold ARR or AGNC, but I have switched to AIG in Sept 2012.
Portfolio contents at 12/31/2013
AIG (92%) BAC(4%) BRK.B(2%), AGNC (2%) ARR(1.5%)
Expose yourself to quality setups and you can make money in any market. Be early to locate relative strength, then exit when things get heated. Shorts are also okay. Find weak stocks and position yourself for continuation.