DVR STB Types

Currently I use an XG1-v3 DVR (has 500gb drive). I use my own modem (Netgear) and router. I have 800 mbps service.  My current tv is only 1080p. I would like to buy a 4K tv. But before I get a new 4K tv, I want to have a new working STB in place and have most of the bugs worked out.

I have some questions and assumptions. What are the newest STBs?

I believe the XG1-v4 is 4k and with an internal drive. Can I use it with my own modem? Will it work with cloud based storage in addition to the internal storage? I’m guessing it will still be compatible with my 1080p tv?

Xi6 --4k yes. Only cloud based dvr, wireless with no RF connector, but does it have a working Ethernet port? Is the Ethernet port 1gig? How many programs can I record at the same time? Work with my 1080p tv? Since it is wireless and or Ethernet does it count towards my download cap? Will it work with my modem?

XG2 --No 4k, has rf connector cloud based dvr, only records 4 programs at the same time.

Xi3 and xi5 --No 4k, no rf connection just wireless, only cloud based dvr. Number of programs to record at same time?

XiD –No 4k has rf connector only cloud based dvr.

Am I correct that my XG1-v3 DVR is not capable of any cloud based storage even for an extra fee?

Thanks!