I personally just like these normal types of saddle pads(including this colour)
Those other ones seem to pricy and personally I think a saddle pad is a saddle pad
Every piece of tack has a purpose and it's not just decorative. The purpose of the saddle pad is not to simply look coordinated with your horse and to keep the sweat off your saddle but to protect your horse's back from the concussion of the combination of rider and saddle. It also has to make up for the small imperfections of the way your saddle contacts your horse (I say "small imperfections" because I hope your saddle fits properly). The pad also has another function and that is to keep your horse's back cool. The material that your saddle is made of should wick the sweat away from his back and not build heat due to the material it is made from.
All this is much more pronounced on a Western or Australian saddle but just as important on an English one. How pricey is pricey when it comes to the comfort of your horse's back and his well being. It is much more costly when you need to have a vet out to correct back problems or when he suddenly develops a behavioral problem due to pain.
Since we have so many young or new riders I felt that it was important to correct your statement.