Arm 1. MVA HIV-B primes at Week 0 and Week 8 + LIPO-5 boosts at Week 20 and Week 28 Arm 2. LIPO-5 primes at Week 0 and Week 8 + MVA HIV-B boosts at Week 20 and Week 28 Arm 3. GTU-MultiHIV B primes at Week 0, Week 4 and Week 12 + LIPO-5 boosts at Week 20 and Week 28 Arm 4. GTU-MultiHIV B primes at Week 0, Week 4 and Week 12 + MVA HIV-B boosts at Week 20 and Week 28