That was also my first chioce, but I could find no one to buy parts from. That's why I went ahead and made my own... I posted a tuning guide which will reduce the trigger pull quite a bit. I wount lie and say that it will leave it copetition style or near the GTX trigger by Charlie da Tuna, but it will make it shootable (even enjoyable to shoot once you get used to it). You can check it out at http://www.network54.com/Forum/392756/thread/1143356613/last-1144019912/Brazilian+Daisy+Winchester+1000X+tune-up+with+pics if you like. As for making the trigger yourself, it is not really all that hard. All you will need is a Drill (preferably a drill press), some files, and sanpaper (and, of course, the piece of aluminum to use for the trigger). Oh, yeah, and a couple of washers to get rid of the trigger side to side movement. I would recomend you give it a shot; besides, if you really screw up the trigger, you can always replace the one you were making with the one that came with the gun, and you can keep trying until you make one that is satisfactory to your needs...
Felipe