Being an Asian and ex overseas student, I found it hard to really talk technical the first time with all the shops mentioned
[ ECS, Nikon on Broadway, Camera House in Broadway, CCC , DigitalCity , Fletchers and prev G&V ]
IF I find one that want to talk to me, is one shop that tried to sell me a D50 while I was looking for a D200

[the ones across CCC , in George St Georges or something the name was]
Out of all, I still find FotoRiesel , ECS and Nikon on Broadway are the best [if you count Melbourne, Dave @ Camera Exchange is the best. I met him once but we chat like we known each other for a long time]
In FotoRiesel there is one older guy and younger guy who is very knowledgeable.
The rest, imho are just sales
Nikon on Broadway move around 2 blocks in to the street they were in and they are close Sat and Sunday now
ECS are good , but when those guys are involved in a cat fight .. all the regulars there should know what it liked
IF your friend is looking for a D300, ECS is having a live demo on them this Friday and Saturday. europeancameras.com said it is an RSVP event and I can't come down as I have a pre-wedding shoot that weekend .
Good luck !
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- Nikkor on Nikon and Fuji -