When it comes to choosing what to purchase, it's always based on the set and not the figs. When I desplay the sets, the figs are just kept inside the sets where they are pictured on the boxes. However, most of my smaller ($50 or less) sets are from the Clone Wars era, so I have all the figs and ships actually set up for a huge dogfight / ground battle, and I realized my clones were vastly outnumbered by my droids, so I did get 3 more Clone Walker BPs to help even it out. Also, the Sandcrawler was (for me) a special surprise in the fig department, so I recreated (as best I could) the scene of Lars haggling with the Jawas for R2 after the other astromech droid broke. So, after that experience, if I passed a set that had not only a great build (which I felt the Sandcrawler was) but awesome displayability due to the minifigs, it would probably jump to the top of my "must-have" list.
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