ariaspi: That's an excellent drive, but it's Samsung, so it is on the expensive side. Alternatively, there's
Kingston A2000, a very good drive, usually at an affordable price (don't confuse it with KC2000, which is much more expensive).
Unfortunately there's no compatibility with 7, so I'll chose a classic SSD Samsung 850 EVO 500GB.
ariaspi: Not many cases come with an optical drive bay nowadays, but that Cooler Master MasterBox NR600 is a solid choice. Or as you already said, get an external optical drive. Lite-On are usually very good.
clarry: I prefer to use an external optical drive. Not because it's better, but because internal 5.25" drives are large, often require a drive cage that may obstruct air flow from the front intake fans, and require more wiring (even with a very large case, I find cable management to be annoying when you have a huge bundle of cables.. one less drive = two less cables). Also, having an external drive is convenient in the scenario where you temporarily need one to plug into a laptop or some other device that has no built in external drive.
The fact is I'm afraid I could have some problems during installation with USB. So I decide for an internal one even if I think as you there will be a little less air flow.
ariaspi: When you find a case you think is good for your build, go on the manufacturer's site and look at the specs. It should say the maximum height for the CPU cooler and maximum length for the video card.
Very good advice. Thank you.
ariaspi: If you want more cooling, go for Noctua. If you want more silence, go for be quiet!.
Cooling is more important in my case: so Noctua will be my choice.
So finally I think that more or less my new pc is ready.
Here's the list of components (a suggestion about cases I chose is well accepted).
One last question about the UPS: is it ok for the new configuration? I need some protection from power surges and autonomy time to turn it off when there won't be electric energy.