Go external.
We currently sell a LaCie external Firewire DVD+/-R/RW drive for €170, so you should be able to get one at less than $200.
Several reasons:
a) Faster. Much faster.
b) Greater format flexibility.
c) DOUBLE-LAYER BURNING. (That's 8.5 GB per double-layer disc, rather than 4.4GB per ordinary DVD-R in the internal Superdrive.)
d) Future-proof. Double-layer is the standard for commercial video DVD, and it's only JUST become available for burning (media are expensive, but will drop). What's next? HD-DVD? Blu-Ray? Once that's settled in a very few years, what about your obsolete internal Superdrive? Exchange it? Or just replace the external? Because
e) Installing a new drive in the 12" Powerbook is a BITCH. You practically have to disassemble the entire thing. Check
http://pbfixit.com for pictorial guides on what to do.
f) The faster burning will mean you can burn more, more often. Which is good, because data reliability of DVD-R is complete **** at the moment. My first (Apple-branded!) DVD-Rs are already having read errors after not two years.
-s*