24/7 doesn't mean you need more power, but a high-quality PSU (which the linked 750W definitely is).
I just fear that your power draw will be so low, the big PSU won't get into the region where it gets efficient (above 20% load, optimal at 50%). That region would be from 150W to 375W, and your build will most definitely stay below 200W even when everything's under full load (the Celeron draws less than 15W afaik).
A Super Flower Golden Green HX 350W would become reasonably efficient at 70W at reach it's peak efficiency at around 175W, so I think this would be perfect for you use case. Of course, that would mean you get less W/$, but I think in this special case this sacrifice would be worth it 😉