A parliamentary system is one in which the executive and legislative branches are one (EG if the president was a member of congress, and chosen by congress).
As to the implication that proportional systems don't result in individuals representing constituencies or geographic regions, there are numerous hybrid systems that manage to achieve the best of both worlds http://en.wikipedia.org/wiki/Single_transferable_vote
Are you sure "parliamentary system" is appropriate here?
The UK has a parliamentary system[0] - and we vote for MPs, not parties, despite some people trying to change that.
[0]http://en.wikipedia.org/wiki/Parliamentary_system