I know cdn can collect EI if they move to reside with their spouse and I "belive" one can still collect maternity benefits.
When you start doing research about relationship visas, check out
http://www.visajourney.com/forums/ (VJ)awesome free visa site. Pretty much tells you step by step on what to do!
In your situation the Cr-1 visa is prob going to be ur best bet as you stated you want to be able to travel back to canada for work.
The other visas you will see on VJ are
k1 (fiance visa,not married yet) K3 is a marriage visa,and cr-1 is a marriage visa.
This link COMPARES all 3 visas:http://www.visajourney.com/forums/index.php?autocom=custom&page=compare
Lots of good free info on VJ, even pics of already filled out forms, and even even info on EI, as I recall some of our members have gotten maternity benefits. I recieved EI, but was just the plain old EI. best of luck