Engineer Builds

I figured I would look here for a little feedback on the Engineer profession. I really enjoy the versatility that the profession has to offer, and I wanted to see if other engineers would share their build ideas, as well as discuss ways to improve what we have already. 

One of the 'essentials' I've found in the builds is Kit Refinement. Tools IV which casts a spell when you equip a kit. 

This build:

http://gw2skills.net/editor/en/?fcAQJAqelspqbnvSdF87IxIFfm0gUo36K6xjh8kB;TgAAyCsouxcj4G7Nubk3A

I found on reddit. It's a heavy support build that focuses on providing boons to allies, at a semi-permanent rate. Taking advantage of increased boon duration, as well as toolbelt recharge reduction, does well in providing these buffs for others. 

This build:

http://gw2skills.net/editor/en/?fcQQJAqalspyanqy5G1LJxoCfGMD9iXxMwcj/UgtA;TgAAyCsouxcj4G7Nubk3A

Is my most incomplete build. It could definitely use work. It's obviously a condition build, but I'm having trouble figuring out what I want to change on it. It's PvE focused, 

And this final build:

http://gw2skills.net/editor/en/?fcQQJAqalIqiY3cTbF2LJyYGf2ECqAgJWwnHsVaBhA;TgAAyCsouxcj4G7Nubk3A

Is what I will most likely use in WvW. 1500 range on grenades? Yes, thank you. It could obviously still use work, and playing with.. but the overall idea is to stack debuffs as fast as possible from the safety of the walls. While others may be using siege weapons, this would give me something to do. Also.. Mortar.. mmmm..

Opinions? Other Builds? Give me what you've got (please? :p)

I will be swapping back and forth between Elem and Eng to eventually pick my favorite - or they may be tied. I can't help you out much as I didn't get high enough on any of my characters to see the stuff that you have. But, you have given me some great ideas - thanks.