Firstly your temps are fine. You won’t get any noticeable improvement in clock speed per volt going from 60c to whatever you can get with a bigger water-cooler, nor will 60c cause any reduction in chip lifetime even if your doing long duration work like rendering.
That said, yes a 240mm (or bigger) rad will drop those temps or noise down if thats what you desire, but worth noting, most factory 240mm AIO’s are not silence optimized, so they tend to have fairly high fin density in order to maintain a smaller more widely compatible footprint while offering good cooling. Same goes for the H80i however, and its pretty thick, so its harder to use for silence than a bigger but thinner rad.
Swapping fans can give you lower noise, better performance or a very slight amount of both, but the Corsair SP120mm are not honestly bad (although are a little more upper RPM optimized), so your looking at top of the market type fans (like EK Vardar or Noctua) for noticeable improvements. I wouldn’t buy those Phanteks fans, they aren’t bad, but they are designed as general all rounders and not in the same league as the Noctua or Vardar, but looks are always a hard compromise. Regardless of what you choose, fan swaps are rarely an economical upgrade, its more squeezing the last few percent out of what you have.
I’d seriously consider staying with what you have unless the noise is annoying, in which case look at what will actually fit in your case, as a 280mm will be noticeably quieter than a 240mm, and a 360mm can be better again (although there is slowly diminishing returns per dollar). If budget no object the EK predator is basically the best AIO, being almost an open loop, but otherwise all the Acetek OEM AIO’s are pretty well priced with similar specs… only really the fans change, and even then they are pretty competitive between brands, so you can buy a corsair, fractal design Celsius or any other depending on price. Later on you’ll even get the exact same results if you swap the fans out.
Another option if your happy with temps but just want lower noise is to buy a larger Noctua tower cooler. The looks are polarizing, but you get absolute top tier fans on large surface area with some of the best mounting brackets on the market for a actually competitive price if your competition is AIO’s. The downside is even the biggest of them won’t keep in raw cooling with the really big rads, and depending on your board and cooler choice you may need to move your graphics card to the 2nd PCIe slot or check your ram height as the XPG Z1 looks pretty big.