I'll prefer
7 rogue / 7 artificer / 6 ranger for a full time ranged build. Eladrin has stated that mech I and insightful damage not stacking isn't WAI so I'm working from the assumption that it'll be fixed before live.
The combination of GTWF, Manyshot, Endless Fusillade, 4d6+18 sneak, enlarged PBS/sneak range I think will make this as optimal as a ranged as much as possible build can be with a decent amount of versatility for good measure.
I'd worry with your bard/artificer/rogue build that your feats would be quite tight and you wouldn't have an alternative for those times that xbow DPS wasn't appropriate.