While that is a fantastic drive I would at least take a look at the
Lite-On iHAS524-T98A with the
Label-Tag feature. New Egg has them for $33.55 after shipping. (It is a real MTK chipset and not a shitty NEC like many of the iHAS424 drives)
Label-Tag allows you to write labels on the disk itself and requires no special media unlike light scribe. However, it does take up a few hundred megabytes of space on the disk as it writes the labels on the underside instead of the top. The drive is also extremely quiet, actually the quietest drive I've had as I don't even hear it running. The drive also has Smart Erase even though it isn't listed on the loading tray.
Totally up to you though, I figure you have done your research I just thought I'd make a suggestion, if you really want light scribe then by all means get the iHAS224 it's one awesome drive.
You could always hold off until the iHAS624 comes out as it will offer LS, SE, and LT.