1) Slicer is not the wheel God, but his recommendation is one I'd strongly consider. You only need to look at all the wheels he's owned and tire sizes he's tried. If you look through any wheel discussion thread, he's usually there to answer succintly.
2) Expensive wheels (doesn't matter where they're made) can be as crappy as Chinese/Phillipine knock offs. Reference the CORR Wheel hysteria, and the Giant ADV.1 thread for this.
3) Yes. There are Mid Tier wheels that may be ok. But they're always going to be a mixed bag. Some sets are good, some are garbage. When you get products made from a company with no reputation, or one that hasn't made the investment to make sure they meet recognized quality standards (TUV/JWL) your experience will be unpredictable.
4) I would take a look at how the spacers were installed. My experience with spacers has been that you really have to install them properly. Was there any debris on the hub that wasn't cleared when the spacers were installed? Were the Spacers damaged/nicked on the mounting surface that would keep them from sitting flush? Aluminum is SOFT, it gouges quite easily) Are the wheel bolts the same length? Are they the proper Length? It seems obvious but you would be really surprised with some of the workmanship out there.
I doubt this thread was intended to dump on the OP's income or whatever direction it looks like it's turning. But it is a good lesson going forward. There's tons of aftermarket for this car, and none if it is cheap (I miss modding my S2000!) You're going to run into lots of mid Tier or bottom feeding aftermarket companies selling garbage for just barely less than the good reputable stuff. I'm beginning to understand this is why all of our cars look the same.....
I hope the OP gets it sorted out.
FWIW, This probably has been shared 100K+ times:
http://youtu.be/BJeFB6SRslk