Scott CR1 size advice

Looking to pull the trigger on a Scott CR1 SL but can't decide between size Large (56cm) or Extra Large (58cm).
I'm 6"1 and currently on a 58cm Genesis Equilibrium, any Scott owners on here can advise?
I'm 6"1 and currently on a 58cm Genesis Equilibrium, any Scott owners on here can advise?
First love - Genesis Equilibrium 20
Dirty - Forme Calver CX Sport
Quickie - Scott CR1 SL HMX
Notable ex's - Kinesis Crosslight, Specialized Tricross
Dirty - Forme Calver CX Sport
Quickie - Scott CR1 SL HMX
Notable ex's - Kinesis Crosslight, Specialized Tricross
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I've now got a 58cm Scott CR1 which is perfect sizing for me.
But that's me, it all comes down to your own individual proportions, flexibility, preferred riding position etc.
http://www.westbrookcycles.co.uk/frames-c6/road-frames-c112/scott-cr1-sl-hmx-road-frame-set-2012-p194662
I reckon this:
http://www.bike-treks.co.uk/451071/prod ... ce=Froogle
Dirty - Forme Calver CX Sport
Quickie - Scott CR1 SL HMX
Notable ex's - Kinesis Crosslight, Specialized Tricross
Better off buying the frame and the bits surely?
@Porlyworly - it would be the 56 for me and I'm around 6 - one and a half. But long legged so short torso. If you are in any way geometrically normal, 58 sounds about right!