The 5R is tri-band with 6m, 2m and 440. What is the 4th band on the 7R?
I have never used the 6m band. The basic antenna that came with the radio works for 2m and 440. To work the 6m band you have to unscrew the tip of the basic antenna and screw on a short extension. The replacement flex antenna that I use everywhere works for 2m and 440 only, not 6m. I also have a mobile mag mount antenna for my car and a base antenna mounted on the roof of my house. The mag mount and the base antenna are both dual-band, 2m and 440 but not 6m. I don't think I have ever seen a repeater for the 6m band. I guess what I am saying is that you won't give up much if you go with a dual band radio. If you find out you really like amateur as a hobby then you can upgrade your license, buy a good base unit and talk on all those other bands. For casual use the 2m and 440 bands are probably all you need. A lot of people do fine with just a single band 2m radio.
A friend of mine has a 7R and doesn't particularly like it because it is fairly large for a handheld. I guess for outdoor use the waterproof feature of the 7R is a consideration, although I don't personally know of anyone who has dropped a radio into water.
I just started studying for the General test. I don't have any real need, it just seems like a good thing to do.