Hi pinkelephant,
I'm also a long time lurker of these forums - I bought my first bitcoins in May.
Questions 1 and 3 can be answered at the same time: probably not. Normal computing power (even when using graphics cards) can not compare to the sheer computing power of ASIC miners that hit the market earlier this year. I tried mining for a week back in May when the difficulty was 1/10th of what it is now. After a week I didn't even mine enough to be able to withdraw from the pool :/
Regarding question 2 there are several websites that offer multi-mining pools/software but I haven't really used them due to my weak computing power.
Coin choose tells you what coin is the most profitable to mine and then sell when compared to bitcoin if you want to choose manually.
http://www.coinchoose.com/If I were you I'd spend a little money buying bitcoins now (but not more than you can afford to lose!). Also, I wouldn't panic sell whenever the price drops significantly. The value of bitcoins seems to always increase in the long run, like 1000% every year....
Hope this helps