The Anniversary special does come in plain edge. The standard uncoated 154 comes in both flavors - serrated and plain edge. You can find the plain silver 154cm blades for around $60.00 new if you look hard on the web. Anniversary models prices range from $90 on up. Everything is the same size and materials except for the coating, and the gold anodized screws and clips.
Great knife. I highly recommend them. I have one anniversary model for daily carry, the black coating is scratched to heck now, but the gold pocket clip is holding up great and looks better for dress clothes at work. I also have three silver 154cm plain edge for my family vehicles emergency knife. I also have one serrated for the tool box. Lets see, that's five of them, and did I mention that even with 154cm steel the price was right.
I prefer the 154cm blades, however, many forumites like the regular steel and they are even cheaper.
My two cents worth,
Wade