I'm sure someone far far more knowledgable than me will answer soon, but my 2c...
I'm quite the newbie, and have found the Benq 1640 (latest model, 1620 is older) to be a great burner. It hasn't given me one coaster, has given me mostly really good quality burns, is fast, quiet, and seems to have great firmware support from Benq.
From my experience and from what others have generally said (including the review on this site, check out the stickies in this forum for it), it's a great all rounder, which should fit the bill for your type of usage. It also has a large range of compatibility with different media. (but you should still check out the best brands to use with it).
It also gives you good and fast Dual Layer support, so you can use 8.5GB discs now, or in a few months down the track when DL media really drops in price you are set to go.
That's my 2c - I havn't had any experience with the other burners you mentioned, I will leave that to others!