When I was researching to buy one last summer, the LG models seemed to be the most affordable, yet good quality. I ended up getting a GBW-H20L. It looks like that one's no longer in production, replaced by the (older??) GGW-H20L. I think the only difference between the two is the GGW has HD DVD-ROM, whereas the GBW does not.
Anyway, I've burned a couple BD's (Verbatim media) with it of concerts I video taped in high-definition, and they look great!