Where should I have my money saved for early retirement?

[saywhatnot]

So we have about $600k in the market and about 60% of it is in 401k and IRA. How do I tap into those buckets if I retire early? Say at 50.  My husband and I are trying to figure this out so we can make changes acordingly.

[terran]

http://jlcollinsnh.com/2013/12/05/stocks-part-xx-early-retirement-withdrawal-strategies-and-roth-conversion-ladders-from-a-mad-fientist/