I just picked up the Streamline Screw cap round top from AZ and I REALLY like this kit.
I have had a couple nibs get damaged by the snap cap Americana design and after a while the snap insert can loosen and unthread if the cap is always "unscrewed" as my wife loves to do.
The one I suggested above has a few things I like about it. First, the centerband has a thin black line so it looks sleek, the post cap is very short and all one color so it almost looks like a standard post end. Plus, the nib is a 2-tone nib. Something that CSUA has made the decision to stop using. Almost everyone I ask likes the 2-tone nib over a solid one many times over.
Oh, and they are on sale at right now !! [
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BTW, these opinions are mine, but are based on daily hard use and the problems I have had.
Honest opinion, right now my favorite kit that has the least issues is the Churchill.