[name_m]Beck[/name_m] [name_m]David[/name_m] and [name_m]Grant[/name_m] [name_m]Jacob[/name_m]. I think [name_m]Beck[/name_m] and [name_m]Jacob[/name_m] share a few too many sounds for ideal flow together.
[name_m]Grant[/name_m] and [name_m]Beck[/name_m] is easier to say, and [name_m]Grant[/name_m] sounds like the big brother. So I would go with [name_m]Grant[/name_m] [name_m]David[/name_m] and [name_m]Beck[/name_m] [name_m]Jacob[/name_m].