I am new to the sport of pistol shooting. A good friend thankfully got me started and l love it. I was looking to put between $800 and $1200 in a 1911 45acp and start shooting it. I hear STI is a great gun, but what about the trigger is it not steel? and does that make any difference. Also, are they built on the basic 1911 style and are parts easy to get.?