I would avoid QRP (~5 watts) for your first HF radio. Get a 100w radio. You will be frustrated trying to make contacts with 5 watts. Sure you will work some stations but you will be much more successful with 100w and a wire dipole.After all the information has finally settled down in my head that FTdx10 is looking good, but the Elecraft KX3 may be my first radio. I'm thinking portable to learn the craft and antennas plus I can add on to the KX3 to make it a home station.
The KX3 is a fantastic radio but it is expensive. Especially for just 5w. The matching Elecraft 100w amplifier is $1,200. So the cost of the KX3 and 100W amp is nearing $3,000.
The FTdx10 for the ICOM 7300 are better choices in my opinion. The ICOM 718 is a good radio but is very basic. As a new ham you will likely want to work FT8 Digital mode. The FTdx10 and 7300 are ready out of the box to connect to a computer and operate digital modes. The 718 will require a sound card interface (~$150), and an RS-232 connection to your computer (very few computers have RS-232 ports anymore).
Just my two cents. I have been in your shoes.