HostPresto can be worth trying, especially since they offer unlimited client accounts, WHM, and good UK-based support, which is nice for managing multiple clients in one place
If your budget is under $40, it fits well and seems beginner-friendly.

You could also look at InterServer reseller hosting, it’s usually very affordable with solid uptime, security, and unlimited-style resources, though support can be a bit hit or miss sometimes
Overall, both are decent, I’d try HostPresto for ease, or InterServer if you want better long-term value.