Just a note that the 110 improved a great deal with the latest 1.37 firmware. I have the big 3 and my 1640 seems best with Normal media, my NEC 4550 or the 110 seem best with DL so far. I like all 3 but if it was going to be just one drive it'd be the 1640 right now. I picked up the NEC in a Mad Dog triple format box at Circuit City for 60 just short of a month ago, and CompUSA carries the exact same model so if you want to try that one just watch the sales between them.
One great thing about either the 110 or the 4550 is they both work pretty well with the Ritek/memorex D01 DL media