I graduated from UBC in 2002, and was also involved with Phrateres my first year on campus. Ultimately, I ended up going through fall recruitment and decided to dedicate my time solely to my sorority, though to this day I have many fond memories and a few great friends from my time in Phrateres
One thing to consider is that Phrateres is often involved in many of the same campus activities as the seven sororities, especially through intramural teams and events (compete in the same division for sports points), exchanges/socials/mixers, and even formals/semi-formals.
Note that there are a number of people from UBC here on GC - some of us are alumni while others are active, together representing a number of fantastic sororities and fraternities there. Collectively, UBC's greek community continues to grow stronger each year!!
The current or past president of the UBC Panhellenic is one of these GCers who posts every so often ~ I cannot remember her screen name but will post when I do.
Best wishes with whatever you choose to do, please keep us posted.