I have a new Santa Rosa\LED MBP. Although my CD and DVD burning usage is probably no more than average, I rip CD's a lot, and of currently am ripping my entire DVD collection to re-encode them for my Apple TV... So the question is, what if I I wear out my DVD-R drive? Is it all that hard to replace? Should I buy an external USB or FireWire DVD-R to "save" my internal one from wearing out? Comments?