I've never changed any of the bulbs in my TF. I have fitted
OSRAM NIGHT BREAKER LASER H7
to my MB Vito. They are definitely brighter than the original bulbs.
I cannot remember which bulbs the F/TF takes offhand but the night breakers are available in H1, H3, H4, H7, H8, H11, HB3, HB4.
Daytime Running Lights are a worthwhile addition.