I really prefer Paypal for all my transactions if at all possible. I have had a couple of bad experiences with a couple of big ticket items. It is too bad that one or two people choose to write worthless checks and ruin it for the rest of the community. It is pretty simple--if you can't pay for it, don't bid on it!
Shipping information
I will ship items, in most cases, the day after I receive a Paypal payment. I use the shipping calculator in many cases to estimate shipping. On some items, I pretty much know how much it will cost to ship, so I just set the price.