I've spent quite a bit of time looking for low profile right/left angle c13 connectors and I haven't found anything other than what you see from Lian-Li. Lian-Li most likely has them special made. If you need just 1 cord then you can get one from ncase in their accessory section.
This is the one but it's not as low profile as I first thought. It's 39mm tall which is 4mm shorter than the ones available on digikey. Still nothing compared to the 28mm tall NCASE one.
I was looking into low profile c13 connectors the other day and was able to find one company who made a fairly low profile connector but it appeared to only be custom order. The lowest profile c13 connector I've seen is the one used in the NCASE M1. Check out this post here if you haven't seen...
Your best bet is the AXP-140. Largest heatsink that will fit. That or go with an all-in-one cooler like the H60.
Here's a build log of someone who used one.
The Zotac z68 actually has more room between the mounting holes and pci-e slot than other boards with that same layout.
Here's an image to show you what I mean.
Looks like there's about 1 or 2 more millimeters of space :) I wonder if this allows the use of some other coolers that were...
This is the only other h67 like what you describe, I believe. But remember, the HSF will be hanging off the edge of the motherboard, so choose your case wisely.
http://www.newegg.com/Product/Product.aspx?Item=N82E16813176009
I like where you're going with this thread. 3 out of 3 PSU's have issues. I also have this PSU however my system is not powerful enough to exceed 300 watts. Though I do plan to build a more powerful PC soon that should definitely exceed 300w. You should make a video of your problem if possible...