Andre,
I have that same problem, and it’s taken me several years to increase my willpower enough to not buy more roses! I do have some experience with a few of these culitvars:
JFK - Unfortunately a steaming pile of hot garbage. For me this rose has ugly leaves, poor architecture and is always covered in black spot. It’s definitely not worthy of the name John F. Kennedy. They probably named it that just so it would sell.
Queen Elizabeth - Supposedly sets seed and germinates very well, but to me it’s lacking in fragrance, black spots very badly in the gulf coast, and it’s already contributed enough of it’s genetics to the rose gene pool. It’s time to move on… OU “Over Used”
Christian Dior - Meh.
Intrigue - Never set any hips for me, and wasn’t very fertile as a pollen parent.
Rainbow Sorbet - I’m a huge fan of Ping Lim! but just like with Queen Elizabeth, it’s time to move away from Playboy (OU) genetics
Now Rainbow Sorbet’s Parent Earth Song sets a truck load of hips, and it’s grandparent Prairie Star goes into UU my “Under Used” Category.
Love - I grew this rose the very first year I stared growing roses, and after a year or two I decided that this rose never “spoke” to me. There are much better reverse petal colored roses out there now.
Neptune - Two thumbs up if you’re into classic hybrid tea form! Also, this rose passes on its form very dominantly so that could be good or bad depending on what your breeding goals are. Keep in mind that this rose, at least in the Gulf Coast, is very weak to black spot, and cercospora leaf spot! Don’t get those two confused. Haven’t really seen any mildew though, definitely one of the best mauve/lavenders out there right now. Other points, amazing fragrance, and extreme seed parent fertility!
Proud Land - Ahh this was one of my original roses I started breeding with. Why? It’s just so darn healthy and makes the hugest fertile hips. Also it’s vigorous, has a rich color and amazing fragrance. Better than both of its parents in my opinion! Proud Land has never gotten the credit it deserves and I’ve always wondered why. This rose is an excellent choice for breeding as it gladly accepts almost any pollen you can throw at it. UU Under Used!
Hopefully that helps out Andre, all of this is just IMHO btw!
-Andrew