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Before choosing a manufacturer it would be best to decide on which period of Roman history for the army. The iconic image of Roman infantry in Lorica Segmentata and semi-cylindrical shields only lasted for a century or so during the early empire. Before and after the shields were oval shaped. The Lorica Segmentat did continue to be used for a time after oval shields were adopted.I can't recommend a 15mm manufacturer as my armies are 6mm. While I do have an early imperial army, I prefer the Republican army due to the variety of opponents and the later empire due to the variety of troop types.
So would it be fair to say that Republican and Late Imperial = chainmail and oval shields while Early Imperial = segmented armour and rectangular shields (i.e. what most people think of as a Roman soldier)?
If you look at the scale comparison thread which is stickied at the top of the Ancients board, there are lots of nice pictures of Republican, Early Imperial, and Late Imperial Romans.