Just remember that you'll have burning problems if your drive is too old due to the firmware not being updated.
I wouldn't worry until you get a few coasters, but I bought $60 worth of dual-layer DVD's and got three coasters immediately. I then replaced my previously great drive with a new Philips for $30 and the rest burned fine.
Be careful about what DVD's you purchase, especially dual layer. If you go to Futureshop or NCIX you can often see people complaining about burn errors. Futureshop is known to have DVD's on sale that are causing problems with many people.
If in doubt, Verbatim has been a good bet but things change.