What is your use for this pc?
If it is for gaming, no amd processor available today is going to be a reasonable upgrade.
Games depend on the performance of the master thread. Few games can make use of more than 2-3 threads.
The passmark performance rating of a A10-5800K is 4639, and the single thread rating is 1462.
Were you to upgrade to a FX6 or FX8, you would get total ratings significantly higher. That applies when all 6 or 8 cores are fully utilized.
But, the single thread performance rating would still be in the 1500 range.
Past that, your A880G+ motherboard supports only Phenom II / Athlon II / Sempron
No telling when Zen will arrive, what it will cost, and how it will perform.
If you want an upgrade now, look to Intel of some sort.
My suggestion would be a I3-6100 and a lga1151 motherboard.
Passmark rating 5500/2102.