The Coda is a flat bar road bike made from steel. The Wingra is not- but it ain't a bad choice.

If you are unsure if a 21" framed bike on CL will fit, then you really should stick to shopping at the LBS. You will get assistance in properly fitting you to the bike, plus if there any glaring defects the LBS should take of them.

Edit: Then again, you could arrange for a test ride of that Coda and see how it feels. Looking at the specs for the Coda, the standover height is 32.16". What's your inseam? Then again, the info is for the current Coda and may not match the one you're looking at...