simple answer get a 5.0 as the only real "benefits" of the 6.0 over the 5.0 are the voice prompts, and venturi bolt.
And you can just buy the venturi seperatly.
I dont know anyone who uses the voice prompts on the 6.0. Youd bee too busy worrying about where the leak is coming from and why theres more paint than paintball coming out of the barrel, than talking to the marker.