I am a GS junky and have 3, although they are not Vision Line. I have Legacy Southern Pacific GS-2 #4415, TMCC Western Pacific GS-64-77 #485, and a K-Line Semi Scale Southern Pacific GS-4 #4449. IMO, the GS is the most beautiful Northern Class 4-8-4. For me, no brainer, Southern Pacific GS-3 #4428. It's not a prototypical paint scheme, but the set sure is pretty!!!
FYI - Southern Pacific designed the GS series and LIMA manufactured them for SP. WP piggy backed a SP order of 10 GS-6 with an order of 6 GS series in 1943 being desperate for more motive power for the War effort, and WP called them GS-64-77. No other railroad had the GS series. GS = Golden State or General Service, depends on who you talk to. I believe SP folks called them Golden State, since SP's corporate headquarters was in San Francisco. Golden State, Golden Gate. Blah, blah, blah, I'm rambling again!
In any case, you will enjoy running these beautiful models!