New amp for DT 990 pro 250 ohm

Hey guys,

I currently have a FiiO E10k usb dac/amp and was wondering what would be a good upgrade to power a DT 990 pro 250 ohm headphones. I am mainly looking for the cheapest option for a new amp so i can play music a bit louder. Not sure if you can buy a new amp and still use the E10k as a dac.

Thanks

Monolith Liquid Spark of ifi Zen CAN are the two cheap options that come to mind.