I haven't been collecting as long as many of you; my collection is a work-in-progress. It began with a few of the blind-bagged micro-figures, and then the Eleven Doctors box sets in both the micro-figures and five-inch ranges. Eventually I started collecting the Titans, and while I didn't plan to get any five-inch figures beyond the box set, I decided that I preferred the Season 12 version of the Fourth Doctor and the Season 24 version of the Seventh Doctor to the ones included in the box set, so I had to get more. Eventually I'd like to have two or three versions of each incarnation in five-inch scale. As I've got limited display space, I keep my thirteen Doctors (in five-inch, Titan, and micro-figure iterations) atop a long horizontal shelf.
Here are Doctors One through Three.
Four through Six.
Hidden behind Titan Five is K-9 (from the recent book-and-figure set).
Seven through War.
Nine through Twelve. When a proper Twelfth Doctor is released I'll probably reconfigure the Time of the Doctor figure with Eleven's head and display it that way.
I don't yet have a to-scale TARDIS; this is the TARDIS ice bucket.
I've also got a shelf dedicated to the micro-figures. Initially I displayed the Eleventh Doctor and his companions beside the Character Building TARDIS, facing off against villains and such. The eleven Doctors stand on a two-tiered riser of my own making.
Angle on the villains. The Pandorica is a papercraft I found online, printed, and assembled, and the Astronaut is from a non-Doctor Who Character Building blind bag.
LOOK OUT, RORY!
When the most recent wave of micro-figures came out I decided to change it up. Gone are Eleven, Amy, Rory and River; in their place are Twelve, Clara, Strax, and Vastra. The eleven Doctors on the riser are now thirteen. And the villains have been updated too: The five Paradigm Daleks are gone, replaced with a single bronze model. The Cyberman and Cyberleader that used to be on display have been replaced by a Series 7 and 8 Cyberman. There's a Zygon too.
Angle on the new Rogue's Gallery.
Vastra seems mesmerized by her crossed swords.