I started with the exact setup you are considering, RIA GI 38 Super. I wanted to learn to shoot well and upgrade a 1911. This gun accomplished both objectives, added LPA adjustable sights, Kimber ambi safety, Ed Brown grip safety, fit EGW sear, Koenig hammer, sear spring, STI trigger and other parts, and made it to 'A' class. Great gun, but as you mention, now I am looking for a new 45 top end for Major, it probably won't help my scores but oh we'll. I ru CMC Shooting Star mags and Colts with 10 rd CMC spring/follower. I say go for it and have fun.