Ronda cards are horrible investment, 1 buyer drove the market so high( he owns the 1/1 auto and 15 or so out of the 25 gold rc autos), and when/if she loses her cards will DROP.
The 4 best cards investment wise are (no paticular order)
1. Anderson Silva rd 1 red auto /25
2. GSP rd 1 red auto /25
3. A. Silva vs Chris Leben rd 1 dual auto/relic /25
4. Jon Jones rd 2 red auto /25
Those are the 4 best from an investment standpoint ong term.
But if you watch MMA/UFC, basically any up and comer, you can make money on.