Which model of available femtocells are you focusing on and is it easy to purchase one (on ebay perhaps)? Cause for 2G the ip.access's nanoBTS imho is best supported by openbsc. If you can give us some more information what device to use (as a start), than we can at least focus on one device and extend to other models in the future.
Did you read the mail ?
It explicitely mention :
in point (c) -> "the Alcatel-Lucent femtocells" in point (d) -> "ip.access/Cisco/AT&T" femtocells in point (e) -> "Ubiquisys/SFR femtocell"
Google for those ..
Cheers,
Sylvain