But buying the stock has no margin at all. You're in it whole?
It's possible to buy stocks on margin. Here's the order for long:
Insider information about significant event -- Far OTM calls and lots of them
Very confident -- OTM to ATM calls / ATM call spreads
Confident - Long stock / ATM call spreads
Speculative - Ratio spreads, short puts, short put spreads, long stock, partial covered call (50 shares long for every short OTM call), calendar spreads, butterflies...lots of options here
Not confident, but probably not going to collapse - OTM short puts, OTM short put spreads
Really not confident -- no trade
