Thanks everyone for the feedback. I am not very familiar with the Portland metro area in general, as I currently live out of state. My reasoning for buying in Portland as opposed to neighboring areas is due to the following:
1) Walkability, biking, public transit, and amenities such as bars/restaurants are very important
2) I am hoping that a home in Portland (as opposed to a more suburban community in other counties) would attract a younger demographic. This logic could very well be flawed, however.
3) I am hoping it would be easier to attract a working professionals who want to minimize commuting times by living in Portland proper
4) I am planning to hold the property long term and will eventually convert to a full time rental. I am thinking (without any evidence) that Portland may be a safer investment long term.
The tax implications for owning in Portland vs a neighboring city is certainly something I should consider more fully. However, these costs will hopefully be mitigated some by the income I receive from my tenants.
@Bruce Bingham and @Mathew Wray would appreciate any insights you have on possible neighborhoods, as my understanding of Portland neighborhoods dynamics is somewhat limited.