I loved the Etonic Stabilites... have the storm shoes you are referencing, as well as SST8's, S3000 ABS (3G Tour Ultras) and basically all of the hi end shoes. I'd say the arches in the storm shoes are about the same as the SST8's. Definitely not as flat as the S3000 tour ultra 3G's.
Interesting enough the new SST hi end shoes coming later this year will seemingly have the same midsole construction (and toe guarding) as the storm hi end shoes.
I'm assuming you tried eBay to find more Etonicsm
Good luck on your quest