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I am currently mining at about 670khash/s from a live CD. I am not sure what I would do if I actually processed a transaction by mistake. Likely make an offline wallet and send the coins to it.
Edit: Another reason I have been in no great hurry to purchase Bitcoins is market volatility. I started valuing Bitcoins at the 30 day weighted average price. Since the spot price is now 25% below that, I should be snapping them up
Still not sure that I understand your attitude regarding $3 vs $20, doesn't the ratio 20/3 remain the same even if the price goes to $7000 ? i.e. if you bought e.g. 200 bitcoins at $3 each then in dollar amount you would have $7000x200=$1,400,000, but if you buy at $20 each then you would have $7000x30=$210,000
i hope you meant 670mhash/s (not khash), but still if you're not using a pool then the chance of getting the 50 BTC reward is way too negligible.
And your comments regarding security were also a little unclear: if you said that you plan to buy, say, 500 gold coins for $1500 each, but first you need to prepare in advance a secure safe to put them in, that would sound reasonable. But for bitcoins, simply encrypting your wallet.dat with a strong password and storing it in several places is safe enough, no? You could even use deniable encryption with truecrypt if you're concerned that criminals and/or the government will try to force you to decrypt it.