If you want to look at "American-type" cattle just hope on over to CattleToday.com Q&A forums and look at the pics posted on there. The cattle you'll see on there will be in their "working clothes," not all dolled up and fancy like that blonde heifer you showed in your first link. If you want to see good quality cattle, IMHO the best way is when they're not dressed up for show.
Now, I'm confused here. Are you, Annoth, looking for cattle to breed for show or are you just interested in breeding cattle just to sale for commercial and/or show use?
All those bulls that are listed as "Irish" type cattle are, as Wanda said, continentals. They are in no way British-breed cattle. If you want British breeds, look for Angus, Red Angus, Shorthorn or Hereford. The American/Canadian lines of Continental cattle are more rugged and albeit "rough" looking than those bulls you posted about, because they're meant to be out roughing it, not pampered and waited on like those on the N.I. link. However, especially with Angus, you will get various variations and discrepancies between bulls and cows due to the various genetics and blood lines available. So just be careful in what you're looking for. Herefords may take a hit in more ways than one (and some look worse than others), but if you're looking for a good commercial cow to start with, Herefords are the best. Put an Angus bull with them and you're set. (BTW, the Canadian Herefords often are better looking than the American ones.

Many still have the old Hereford look to them, not the real red-necked ones like that which seems to get more common down south of the 49th parallel. Also, the British/Irish Herefords have more continental influence (with Limmi and Simm thrown in) than the ones here at home in the US and Canada.)
With that cross, though, if you ask me, you might be looking at a bit of pampering to do. JMHO, but for the kind of operation I have in mind where the cows need to actually work for a living and not laze around in a straw bed all day, I'd rather go with a solid, non-show-type commercial heifer (the red-factor Char heifer here is just too blossomed up [with a little bit of photo-shop done to enhance her looks] for me to see her real quality as a sound heifer: not liking the 2D effect on the shoulder and heart girth area) crossed to a good bull that can throw calves suitable for raising on forage, not show.
And yes, the last link shows a double-muscled heifer. I wouldn't be surprised if the bulls in the N.I link are exhibiting a bit of DM either, especially the Belgian Blue (Alibaba) and possibly the two Limmi bulls. Double muscling can happen in any beef breed if the genetics are right, not just in Belgian blues and Piedmontese.
Those are all just my thoughts and opinions.