don't worry too much about the GDI pump... it doesn't need a full replacement now. i got mine done about 8 months back and it's running perfectly fine. cost me around 35k to do it.
my symptoms were
miss shifting (changed the oil 2 times in short intervals and that sorted it out)
not accelerating (serviced the GDI pump and it's working fine)
i got my pump done by technodrome.. speak to dileepa on 777425123. he will help you out.