Congrats on a classic shooter and my favorite semiauto Colt!
I'm sure someone here will chime in with good advice on the finish.
Grips are as varied and popular as custom wheels on a car, so just search the net, look at pics posted here, but, most importantly, see if you can actually hold and shoot different "stocks" to see what fits your hands and helps you shoot best.
My shooting preference (not bling preference) is the factory, rubber, Colt wraparounds. Be be aware that they will RUST under them if you don't remove and oil once in a while.