There isn't any single strategy. Focus on buying good companies and don't sweat the timing. If the company has strong growth potential, you won't be kicking yourself in 5-10 years if you could have gotten in a dollar earlier. Use your available cash, and when you need more cash to purchase another position, look to your least performing, least potential assets for liquidation.

Fuskie
Who emphasizes it's not so much about the cash but about the company...