Annually, just do:
Transoesophageal echocardiogram
Ultrasound of liver & kidneys
Routine checkup, i.e., every 6 months or more frequently:
Lipids, haematocrit/haemoglobin, liver (GGT, ALT, AST) & kidney (24-hr creatinine clearance test, specifically). Adding C-reactive protein (CRP) is good also, especially if using black market gear.
If you really want to splurge:
Serum IGF-I
Apo B / Apo A1 ratio