you could always use ETFs for shorting segments of the market, if that interests you. A thread here on zecco has some recommendations for ETFs and addresses some of your concerns:
http://www.zecco.com/morningstar has a useful ETF screener:
http://screen.morningstar.com/ETFScreener/Selector.html
if you search by "morningstar category" = "Bear Market" you will find some options for shorting various sectors.
As a plus, some of these ETFs actual pay out a dividend and you do not need to keep additional funds aside (not earning interest) as security. Most (if not all) of these funds have some expense ratio > 0, but that does not mean they should just be written off. For a reference on expense ratios, this should get you started:
http://www.fool.com/school/mutualfunds/costs/ratios.htm