if you don't have much experience then,,,,go with cheaper and see if you can keep them alive. easy to spend $25 per chicken and $125 on shipping for older pullets, buy chicks
remember some of these breeders are too concerned with winning the shows that they have sacrificed egg production, enjoy your search, that will be as much fun as raising them, I started with show winning Brahma and had almost no eggs. decisions can be overwhelming, try and stay with the Rhode...
this is the kind of information you get when you start to google "Mohawk Rhode Island Red Chicken"
http://jimspetsandpoultry.weebly.com/reese-mohawk-rhode-island-reds.html
Cackle's Rhode Island Red will have some kind of cross about five generations back so they will get about 50 more eggs a year. The golden comet is different, I think that cross is only one generation back but I am not sure. You can call Cackle and tell them what kind of bird you are looking for...
hatcheries have crossed the Rhode Island Red with breeds that lay lots of eggs, breeders that breed with the shows in mind lay fewer eggs.
if you want eggs buy from a hatchery like Cackle