Animation rendering is one of those GPU intensive tasks your mama never warned you about. Whether or not your "light 2d animation" fits that category is something we'll not know. In addition, the second you think of bring up 4K, you might want to consider the iMac Pro — in case you decide to go there. Definitely go for the Vega 48 if not doing the IMP. If you get a gig, Time saved=Money earned.
That said, the 8 core iMP in the Refurb Store is $4249. Has a Vega 56, 32G RAM and a 1T SSD. The T2 chip and 10G Ethernet let you link to a 2018 Mini in case you want to crunch large animation files should your interests wander in that direction.
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