Looking back on my 2017 purchases, I have to say it was a pretty good year. I began selling off many of my Parthian drachms to reinvest in more Parthian tets and silver fractions, a process I plan to continue in 2018. So, overall my Parthian collection shrank a lot in 2017, but it got a bit more focused denomination-wise. My interest in the AR fractions increased through the year. My love affair with tiara-type tets continued and I picked up a bunch, some of which I show below. I also added to my collection of coins from Elymais and feel like that group is shaping up nicely. It's not yet anywhere close to where I want it to be, but it grew steadily through the year.
Here are my favorite 20 of '17. I've posted a number of these here before (but not all of them), so there are quite a few encore appearances below.
I start with my favorite Parthians from 2017:

Orodes II, 57 - 38 BC
Parthian tet

Pakoros II, struck 78/9 AD
Parthian tet

Vologases I, 51 - 78 AD
Parthian diobol

Vologases II, struck December 78 AD
Parthian tet

Vologases II, struck 77/8 AD
Parthian tet

Vologases III, struck 121/2 AD
Parthian tet

Vologases III, struck 123/4 AD
Parthian tet

Vologases III, struck 123/4 AD
Parthian tet

Vologases III, c.111-146 AD
Parthian tet

Vologases IV, struck 155 AD
Parthian tet

Vologases IV, struck October 172 AD
Parthian tet

Vologases VI, struck 210/11 AD
Parthian tet

Vologases VI, struck 219 AD
Parthian tet
Now my favorite pick-up's from Elymais this year:

Kamnaskires III, with Anzaze, 82/1 - 73/2 BC
Elymaean tet

Kamnaskires IV, 63/2 - 54/3 BC
Elymaean drachm

Kamnaskires V, struck 46/5 BC
Elymaean drachm

Phraates, early to mid 2nd century AD
Elymaean drachm

Phraates, early to mid 2nd century AD
Elymaean tet (unpublished, unique - probably my most important pickup for the year)

Orodes IV, c. second half of 2nd century AD
Elymaean drachm

Prince B, 3rd century AD
Elymaean drachm