First, keep in mind all finishes can get scratched. Wilson's Armor Tuff is a very good finish IMHO, and I believe they'll apply that if you want (you already like the look).
That said, if I were wishing to refinish in the toughest out there, I'd be very tempted to try Ion-Bond (try google, not sure if it's one word or two). Rumored to be about as or tougher than hard chrome (which is one of the best). In fact I'm pretty sure within a couple years I'll have a customized 1911 finished in it (just need to finish a couple other project guns first!).