Complex Ethical Decisions - Which program?

A few days ago I considered the question of "How to decide how to allocate charity money?" on the level of adoption vs. in-country help.   Today I am struggling with a related question.  Having agreed with my husband to begin the process of a special-needs adoption (Yay!) we must decide how to proceed.

Russia:
  Pros: Many available children; Our home-study agency has a program there; Lots of available info; Travel is in shorter chunks; Russian is spoken in our community
  Cons: VERY expensive; Unstable program due to tensions between Russia and USA; Did I mention EXPENSIVE?

Ukraine:
  Pros: Easier travel than Russia in terms of distances; Great need!; Somewhat cheaper than Russia; Faster process; Russian is spoken in our community
  Cons: Can't officially pre-select a child based on photolisting; Travel takes 1-2 months!

Bulgaria:
  Pros: Easier travel than Russia in terms of distances; Need varies -- some orphanages are decent, others are abysmal; Cheaper than Russia; Easier travel in terms of number of trips, and only 1 parent has to travel
  Cons: Process is sometimes very long to referral?

Serbia:
  Pros: Much cheaper!; Much smaller country -- easier travel; Quicker referral
  Cons: Very little info before the referral; Very few children; Travel takes 3 weeks in-country for both parents

Right now we are planning to look into Serbia first.  If we can get a good match, then that would probably be the easiest to manage.  If that seems to dead-end, we would probably bite the bullet financially and go with Russia, so our agency can help us.  We were told that we can change the country once on the USCIS forms.

On the one hand, the Serbian orphans need families just as much as the Russian ones, so a cheaper, faster process would make it easier to bring one home and fulfill that need.  On the other hand, the Russian orphans are not at fault that government regulations on both sides of the pond make it so BLIPping hard to save them.  If we have the resources to help them, then why discriminate?

How do you choose which needy child(ren) to help?