I'll cast a vote for 58, split the difference. The head tube length/stack on that 60 emonda sl5 looks huge at 210mm! While the 56 would start out more aggressive to begin with, and leave you very little room to grow. Test ride the 58 and 60 and see what you think.

FYI-I'm 71.5"/33.75 inseam and both my bikes are 56. Although I'm well into middle age at 48, my fits lean toward more aggressive, racy side 110/120 stems with 3-4" of saddle-handlebar drop. I like getting low to help compensate for my lack of power . I could probably ride either 56 or 58 on that trek sl5 but likely wouldnt be able to get the bars low enough for my liking on the 58 even with a slammed stem.