Arcane Archer Trapfinder- Need some advice

[skorpion352]

I want to build an Arcane Archer Ranger that can disable traps and open locks to use when soloing or if a rogue can't be found. I can't decide between using Rogue or Artificer levels for this. I'm looking for 15-16 Ranger levels, and 4-5 Rogue/Artificer levels.
Some other info:

Race: Human
Character is currently level 14 (10 Ranger/4Rogue). I will be using the free +20 LR given as part of the new enhancements system, the order that levels in each class are taken is not important.
Will have Dragonmark of Finding as Human bonus feat (upgraded to Greater via Enhancements)
Any extra SP will probably be dumped into Haggle, unless someone can suggest something better.
I have access to 32pt builds

While I'm just looking for some advice one what class to take for my Disable Device and Open Locks skills, if anyone has a tested and viable build to recommend, that would be appreciated too.