Sv 8: Good fleet, plus quite fast between Tampines & Toa Payoh, if you dont want to bother to change buses
Sv 23: Linking Tampines super fast to Bendemeer Rd, where you can access other areas from it (eg connect Sv 65 to Orchard, Sv 857 to Suntec etc)
Sv 969: 20-30 min between Tampines & Yishun, beats the MRT anyday...
Sv 89/27: Fast to Sengkang from Pasir Ris/Tampines respectively
Sv 39: direct link from my Loyang Ave bus stop to Yishun, take this if I dont want to bother change at Tampines Int to Sv 969
Sv 72: The best ride from Tampines - Hougang Ctrl, beats Sv 27 or Sv 89 which winds through Sengkang...Sv 72 just passes through Tampines Rd, aka a mini-expressway
Sv 25: Quite a speedy ride between Bedok & Ang Mo Kio, has tons of VSOs as well (but i always get the O405s
)
... the only SBST which goes to zoo...