Quad makes some really fierce headphone amps that can sound great and they're reasonable prices too. Nothing like hifiman or t+a prices but definitely quality amps. Even not as bad as Focal's very own Arche at $2.4k, since you're driving Utopias. Check out the VA-One+, PA-One+, and the Venas. They're great headphone amps, the One+'s for tubes, and the Venas for solid state. T+A put out that HA200 recently and it is a serious little integrated headphone amp too. Costs ya a pretty penny tho.
Best of luck!
Best of luck!