Hi Kitty,
The big buddha, is about 6kms from Wat Chalong but I have been to neither but intend to in May. Have a look at these web sites

Jamie's Phuket
he has 2 entries about the big buddha

Phuket Big Buddha: A big idea becomes a giant landmark
this is part of asia webdirect which has a heap of info on what to do see in Phuket. It has some good photo's info on the Buddha. It has some really nice views from it from what I have read.

Cheers

Karin