Interesting link. I've been running Silver*Stars on a J30 for more than a year, but not H3 bulbs. I wonder if the Miata has vibration issues with their fog lamp mounting.
On the DSM, I run bulbs I got out of a case lot on eBay- 100W highs, 65W lows. I use hi-beam bulbs in the low beam housing, with no complaint from other drivers. The boxes are branded "Interdynamics", I think, but I don't know who made the bulbs. Probably Philips.
If you break a Halogen bulb's filament, you can repair it by tapping on the housing with the power on. If the filament can get close enough to its broken gap, it will re-weld the filament. It will usually keep working at least until the next time it's turned off, and sometimes this fix will hold for years.