I'm not exactly sure why there is lag, I'm not much of a computer/technology wiz. The gamebridge is basically an adaptor that connects to your laptop via USB (if you got your dell has a USB 2.0 port, you'll be fine.) This is probably the reason why it lags too, since the USB is probably a slower connection than whatever's on the TV. Just my theory. I've only played GT4 on it, and the lag has always been playable. Also, the sound quality isn't that great either, depending on the computer. On older ones there might be more static.
You're from Toronto too right? I got mine at a place called Canada Computers (http://www.canadacomputers.com/)
, although I hear they don't carry those anymore. I've seen some on EBay as well, so you can always go that route if that's available to you.
Update: NM, I found a link, here it is: http://www.canadacomputers.com/index...2&cid=CC. 344
I got mine when it was on sale for like 15 bux, so if you're willing to wait, the price will come down. There's another version where you can use your laptop to watch TV as well, but I think that's like 50 bux.