Browning's Citori White Lightning will, in all probability, serve you extremely well in the blind and on the ATA field. I realise that most people are talking about ATA when they say "Trap". Trap also includes the international game, which is virtually a completely different sport. The makes that I talked about above are suitable for both ATA and International. The Citori makes an excellent choice for ATA, but less so for International.
For both ATA and International, I would advise people to stay clear of ported barrels. While ported barrels are legal in both games (subject to a bunch of rules in the International game), and they do reduce muzzle flip, they are despised by all the other shooters in the squad because of the excess noise. Similarly, semi-autos are common in the ATA game, but rare in International competition.
We're not talking about semis here, but I wanted to point out some of the similarities and the differences between equipment suitable for each game. A Citori would serve you well at ATA and would make a decent starter gun if you ever decided to try your hand at International Trap.
You nailed it. Availabilty of models differs between the US and Canada because in the US CZ-USA decides what models to carry (and probably influences what new models are produced), whereas the Canadian volume hardly warrants bringing in all the current models, let alone creating new ones specifically for this market. I'd be willing to bet that CZ sold more shotguns in Canada than it originally expected to, though. They tend to be modestly priced for the segments in which they compete. While product quality could be improved, doing so would push the prices up to where the market is already saturated (and demand significantly lower because of it).