I had the same experience re WiFi and encryption, but in my case it had to do with 10.2 by the time, that didn't support the encryption type of the new router with the old USB stick. So for me a low budget USB stick that came with the router works without problems (since I updated to 10.4 a long time ago).
RE: displays, I was investigating displays, too lately and I decided to look out for an IPS panel that is flicker free (doesn't use PWM), because I heard you can work longer with those, because the eyes don't get tired as quick. But it might be a bit of voodoo, because only some people see an advantage, could be, that it has to do with wearing glasses (I do). People with glasses to recognize other effects of displays easier, too.
An architect lately told me, that the newer Apple displays (iMac and MBP) have a stronger blue, hence he uses a BenQ display for work.
I suppose that bluish thing isn't the case in the old cinema displays.
RE: ATI 9200
I have an ATI 9200 PCI original and a flashed 9200 AGP.
Erik, didn't you once try the Geforce 5200? Do you see advantages over the 5200? I'm interested, because I played with the idea of getting one some time ago and have no comparison. Maybe a scenario to see a difference would have to be found anyway.
I am still searching for a FW800+USB2-PCI-X card. Because my eSATA ports tend to be unrealiable and FW is always reliable. Also PCI-X, so that in Firewire800 I get the full 65MB/s. For FW400+USB2 PCI is ok.
I lately found a FW800-PCI-X card for 8,-EUR (are sold new for 50,-EUR usually

), but I didn't buy it, because I actually don't really need it.