I'd find out where the parts are sourced for "JDM" peices before going that route. The mark-up on the suspension arms from there seems as though it isn't worth it considering it's likely they outsource heims and hardware from the same places as "lower end" companies.
The best route seems to be the smaller US brands that use standard thread heims from companies like QA1 and Aurora. Although metric heims are available from those companies, they cost about twice as much. Even with expensive heims, expect to replace them a fair amount, so having standard threads would help a lot with that. If you're daring enough to stay with cheaper metric heims, you can get metric rod ends pretty cheap from
http://www.midwestcontrol.com . The DXTM-16's that I used in my Motoria arms are rated to some 17,711 lbs.
As for the Wicked rod ends, they seemed decent enough when I looked at them, but I'm assuming they seized in CBARONYC's case. Open faced rod ends require a LOT of maintenance, especially when located in an area that sees a lot of debris such as brake dust. It's also a good idea to keep them captive, in a way that if they pop off, they'll still be retained by some method, even an oversized washer. Still, having seen this happen twice makes me wonder if I should switch to a high-misalignment heim from another brand.
On a final note, if you're switching to spherical bearing rod ends on your suspension, expect to put a LOT of maintenance into them, especially if you don't run boots!! If you've ever been to a club racing event, you'll see people checking, cleaning, and regreasing rod ends on a race to race basis, which is pretty much ALL THE TIME.