Before deciding on the OBi110, you need to understand how to use the additional port: LINE port first.
The OBi LINE jack is an FXO port for connecting to an
outside PSTN landline.
The OBi PHONE jack is an FXS port for connecting a phone or multiple phones via your house telephone wiring.
Read this thread for more insights:
http://www.obitalk.com/forum/index.php?topic=9334.0 I got an OBi110 for a different reason, may even appear irrelevant (disclaimer).
I don't need an extra PHONE line, nor 4 different Service Providers offered by the OBi202.
I look at the physical size of the OBi200 and the OBi100, they are very size "efficient", reads: relatively small foot print. Then I remember reading a review somewhere (amazon?) someone complaint that the 100 runs hotter relative to the old 202 side by side. Reading another review claiming that they replace the OBi100 after 1 year of use, I suspect "physical size", or how the heat is naturally convected, dissipated would/may have something to do with a shorter life span. Looking at the 110, it is almost double in size, with those venting slots on tops, I just go for this one! After a few days running, I check the case temperature, it seems fine to me (not hot, slightly warm).
As for your need, I am out on a limb to suggest this: if you and yours in 2 different locations, and if WiFi is affordable, and if you both have an iPad, Apple computer, or an iPhone, FaceTime would be an elegant solution

!