The literature I read really didn't talk about options before expiration, especially with spreads. They're always expiration graphs, and the decay I had to "experience". Anyways, there's only so much you can learn from reading. Any losses incurred from a lack of knowledge/experience I would call "tuition".
The CBOE offers a free option calculator in its OPTIONS TOOLBOX which can be downloaded at: http://www.cboe.com/LearnCenter/Software.aspx
OptionsOracle. You need to determine your own Vega for price moves, but it's seriously a good piece of software.
I don't have the same option prices: http://finance.yahoo.com/q/op?s=XLF&m=2009-12 You paid 58 cents for 10$ puts on the XLF. I hope you mean 0.058 cents.
I think what people are trying to show you is that you can figure this out yourself with any of the free option calculators. We can figure it out for you but that probably isn't going to teach you anything. So take todays closing price, figure out the volatility from the closing price punch it into a pricing calculator and voila you have your answer. Options guys tend to go straight over your head. Here is a screenshot from NumaWeb. I have found if you are polite option guys will bend over backwards to help you. Post your questions articulately so that lurkers can benefit. http://www.numa.com/cgi-bin/numa/calc_op.pl