In addition to the 1-1/8" to 1-1/2" spec, you need : For tapered 46mm/56mm OD head tube
This the outside diameters of your frames head tube, give or take a few thousands of an inch.
No clue if item 1 of 4 will work. Not enough information.
Link 2 of 4 takes me what appears to be a straight 1-1/8" to 1-1/8" headset. No, will not work if that is the case.
Link number three to the sweet Chris King headset: May work. Missing info you can probably find on CK's website.
You know...just go to FSA's really informative website. Look up the headset Nashbar specifies to fit your frame. Write down the pertinent specifications and cross reference them on Cane's and Chris King's websites.
Personally, I've use a couple Ritchey and FSA headsets and one Cane Creek. I've not managed to destroy any of them. None have required replacement and I'm the guy that used to destroy a Campy Record or Super Record headset to the tune of one per year or every other year at the outside.
I've got the same FSA you spec'd from Nashbar in my TREK 1-1/8" to 1-1/2" Emonda. Not a darn thing wrong with it. I would not over-think this one. If the FSA option works according to Nashbar I would run with it.
And if you could, let me know how you like the Nashbar bargain basement carbon frame. I came close to pulling the trigger on one the last time they put them on sale. I think they're a great deal. I might build one up this Winter with the new Campy Chorus EPS stuff, a DEDA cockpit and Selle Italia Flite just to freak people out. And then slap an el cheapo pair of Aksiums on it as my training wheel reference standard.
