I received my Primo a few days ago and man is it a gorgeous case. However, it's really not worth the 60$ over the 750D if you're not going to watercool your rig right away. The 750D is well capable of holding a sweet watercooling gear; the only difference between it and the Primo is that the latter helps you a bit by having specific watercooling support ready for you such as a dedicated reservoir bracket or even pump mount. In a sense, because of all of those dedicated pieces, there is effectively less space than the 750D and therefore may lead to compatibility issues when the time comes for the upgrade, not to mention by that time they might release a better case in the Enthoo line up, who knows.
As for the fans, if you're going to watercool your rig, you're most likely going to buy your owns like I did. It's a good thing to have though. Either way it's up to you. Are you ready to sacrifice a bit of space and compatibility issues for specific watercooling support or save 60$? The choice is yours.
Pros of Primo:
- watercooling support gear
- rubber rings on every screw, preventing some vibration
- massive radiator support (up to 2x480 + 2x120 + 1x240 all at the same time, sortof)
- Lots of cable management and material to do it (velcros, hooks, zip ties, etc)
- cleaner? if you don't like to see the power supply, it's hidden
Cons:
- May have compatibility issues with long graphics cards and many pci cards and such if using certain dedicated watercooling ready gear such as the reservoir mount
I don't have a 750D so I can't tell you the specifics of it but we all know it's a great case
Personally in your case i'd go 750D but don't get me wrong, the primo is awesome