Spain. Why? They have carried their Euro-winning form into the Qualifying stages, having notched 4 straight victories since their 1-0 win over Germany. Their strike duo of Torres and Villa have been in top form in their respective leagues. Everyone has been playing well. The last time Belgium and Spain met in the Qualifiers, Spain won both legs 2-0. I don't think Spain will slip up here.
Roland's prediction: $5 on Spain -0.5 @ 1.700 = $8.50