If they wanted to do a SAS, ArtSweet's idea makes the most sense from a "marketing" point of view. Do the work once &
release it 3 times, once for each city. Seeing a GTA w/ an open map from the beginning would be a welcomed change, it's
the one thing I don't like about GTA.
In LS you could play as Sweet or CJ in the events that led to his leaving LS, or the brother Brian.
In SF a younger Woozie (before an accident blinded him), or get Truth's back story.
LV could give Kent Paul a go, or even the mis-adventures of Rosenburg.
SAS could be a fond farewell to the PS2 & if broke up into 3 episodes should run on the PSP okay.