mSATA SSDs for a net 6501

I've got a couple of net6501's running OpenBSD 6.0, and I'd like to
replace the mSATA SSDs with something larger. The SSDs I have were
purchased directly from Soekris, and looking around the market there's
a lot of mSATA stuff that I'm not sure would work. Any limits as to
size, SATA version, etc. that I should watch out for? Any specific
recommendations? If I could get 60G I'd be a very happy camper.

Any assistance greatly appreciated.

-- 
Jeff Simmons			                [email protected]
Simmons Consulting - Network Engineering, Administration, Security