Portland has landed a top-tier slots on a much-watched real estate investment list. The fourth quarter report from Dallas-based HomeVestors identifies both good rental markets and areas expected to experience rapid home price growth. The criteria includes markets where the population is growing at a 4 percent rate or better, the job growth is higher than 2 percent and where unemployment is low. Portland ranks sixth on the list, just ahead of Seattle. Grand Rapids, Michigan, topped the Best Markets…