iMac signmaking possibilities

I'm just getting back in to the signmaking business again after 5yrs out of the game, I currently own an iMac 27" and would like to design/cut and edge print from it using only one program if I can get away with it, I previously used software called composer (now updated and called omega i think) i'm aware this gerber software does not run on macs but can anyone recommend what software I can use, to be honest I haven't bought a plotter just yet as i'm still unsure what to get but got my eye on a graphtec 5000-60 from mdpsupplies http://www.mdpsupplies.co.uk/ce5000packa.asp
all help and/or info would be gratefully appreciated thanks in advance.
also if anyone uses a mac to design/make sign i'd love to hear from you.
Cam@icasign