These 350 new buses should be replacing Volvo MK3s and NAC
VO2x in near future.
Hope that all the unused 8xx4 regoes will be filled. The Volvo
DDs should be continue using 75xx series.
1450 new buses = 200 Euro 3 Volvo B9TLS + 500 Euro 4 Scania
K230UBs + 400 Euro 5 Scania K230UBs + another of these 350 new
buses
SBST should have bought Mercs instead 
900 new buses are meant to replace CRB, Merczs
Whereas 350 new buses on next year are meant to replace MK3s
& lo3xs.
Provided no more further lifespan extension of LO3xs,
LO3xs would be deregistered on end on August 2010 (SBS9000S
batch)
LO3xs registered earlier than VO2xs and VO3xs.