Dell - Inspiron 27" Touch-Screen All-In-One - Purchase

Am looking to buy one again. The Inspiron 27 All-In-One has 3 models.  The 1st 2 I can add 2.5 HHD Storage inside. The last one I cannot. Let me know your thoughts.

7710 - Hard Drive 512 GB, SSD (boot) + 1 TB, 5400 RPM, HDD (storage) - (Graphics Card

NVIDIA® GeForce® MX550, 2 GB GDDR6)

7720 - Hard Drive 512 GB, SSD (boot) + 1 TB, 5400 RPM, HDD (storage) - (Graphics Card

NVIDIA® GeForce® MX550, 2 GB GDDR6)

7730 - Storage 512GB M.2 PCIe NVMe Solid State Drive (Graphics Card

NVIDIA® GeForce® MX570A with 2GB GDDR6 graphics memory)