I'm having the same dilemma. Which one to buy? I know (having sold them retail) that as a whole the Ricoh brand has had quality problems. Especially Ricoh media is terrible.
I haven't heard much on the Sony and would like some input.
I've read really good things about the HP8100, but the cost is high for eide.
For that price I'm considering going for a Yamaha scsi 4416sk which includes a scsi card for about $380.
Ricoh media terrible? I LOVE using Ricoh media. Made over a hundred cd's w/ exactly two media related screw ups. Memorex had two screw ups in the first ten and so did sony. In fact, of the 6 to ten types I have tried, Ricoh has been, by far, the most reliable.