Even a quality 450W PSU would be more than sufficient for your rig. Note that it really must be a good brand, not some dirt-cheap noname unit. In general, any PSU with 5+ years of warranty can be considered to be of decent quality. Seasonic, XFX, EVGA, Corsair, Antec and so on are generally all good PSU brands.
And if you later desire to upgrade to more powerful GPU, it would be a good idea to get a 550W or even 650W PSU now, so you won't have to upgrade later. More reserve cannot hurt.
If you need a very specific recommendation, then here, this one would be great:
https://pcpartpicker.com/product/KmgzK8/seasonic-focus-gold-550w-80-gold-certified-semi-modular-atx-power-supply-ssr-550fm