ATIC sucks! They traditionally have decent prices but they have the worst service known to man. They also have outstanding BBB complaints as well. I would never buy from them.
I've heard that A-Power is good as the guy who owns it is supposed to be fair and give a good deal and/or is good to deal with.
I've bought my stuff from ICIComputer in Richmond. They are pretty good and the prices are relatively competitive although a few bucks more than the absolute rock bottom advertised prices.
http://www.icicomputer.com
Netlink on Kingsway seems to have an up and down rep. My friend who's a sys admin used to deal with them and he said he has had it up to here with them. So, that doesn't sound too good. Their prices are not that great either.
Vanco Computers seem to have pretty cheap prices although they are pretty new and I haven't heard their rep yet.
Some friends bought their system from Addax Computers in Richmond near IKEA and they liked the service there. Check it out.
http://www.addax.bc.ca
If you haven't already the new Computer Paper has come out. Pick up one and check the ads.
Lately, i've taken advantage of some good Onvia.com deals. Like the Samsung 950p with coupon and free shipping. That was sweet.