I am looking for a good, well-rounded DVD burner that can operate on both Mac and Windows. I'd like dual layer, multi-format, and high speeds on all fronts, including cds. I'm considering the Sony DRX-820UL/T, but that's only because it's the only one I know about that seems to match my desires? Is it good? Are there other options? In general, how do USB/FireWire external burners match up to their internal counterparts in terms of access speed? I thought I heard that newer versions of iDVD will now work with 3rd party burners. Is this true, and is it limited to a specific list of burners? In your opinion, would a drive like this be a better option to pair with a MacBook than the SuperDrive currently offered at that level? Thanks.