Join Date: Aug 2008
Location: Ann Arbor, MI
Bikes: '15 Kinesis Racelight 4S, '76 Motebecane Gran Jubilée
Mentioned: 8 Post(s)
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There's a whole subforum about fitting here where you may get deeper analysis, but I'll say the 56 sound too big, by which I mean, although you can ride it and you liked it, and that counts for a lot, you'll probably find more flexibility in fit options going down a size and enjoy some benefits from things like a shorter wheelbase, tighter triangles, and more seatpost extension.
It's not a huge deal either way probably, but given this is your first road bike, there's a lot yet you don't know about what characteristics you'll want down the road, so I'd err on the smaller side knowing it's easier to adjust things out/up to fit than it it is to pull 'em back and down because at some point you hit the fixed frame dimensions.