First road bike

Looking at buying my first road bike, been looking for a while now and have seen this on offer ,Eddy Merckx AMX-1 Tiagra 2012 Bike, but not sure about the sizing, have read the review on here and dont quite understand what size I would need, any help on sizing appreciated, I am 5ft 10 with approx 30 inside leg.
work hard, play hard, fall hard
cube stereo 2010
Felt Z95 2013
cube stereo 2010
Felt Z95 2013
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This link could also be useful for you:
http://www.competitivecyclist.com/za/CC ... ATOR_INTRO
Best go into yout LBS and try a few out though
Just to clarify.......it was not an Eddy though
cube stereo 2010
Felt Z95 2013
Ribble 7005 Sportive Frame 52cm, with a tiagra groupset and a few other personal options, or Eddy Merckx AMX-1 Tiagra 2012 Bike i will probably have to wait for the ribble but can get the AMX-1 next day, not in any rush though, obviously geometry will be slightly different but to a road novice probably wont make much difference
cube stereo 2010
Felt Z95 2013