I've never thrown the D5, but it might be a good option. I have D4s, and they are pretty solid understable discs. They also have a 2.3cm rim compared to the D5's 2.4cm rim. Personally, I prefer 2.3s over 2.4s.
I also have Westside Kings in each plastic. The TP King is ridiculously understable, but if you figure out the hyzer angle to prevent it from burning, they will turn considerably and glide forever with little to no fade. The DD Trespass is my primary driver, and I max out at around 425' with that. I can get TP Kings out over 500'.
VIP Kings are much less understable and easier to control. They also fade more and glide less. I'm lucky to hit 450' with them. The Kings have a 2.3cm rim, same as the D4.
I also have a Star Katana (2.5cm rim) and Champ Vulcan (2.4cm rim). I find the Star Katana to be a little more understable than a VIP King, but less so than a D4. The Champ Vulcan is very close to a TP King, but with less glide.
During a round, I bag a VIP King and D4. If I could only carry one, it would probably be the D4. It has more turn, less fade, is slightly longer, and seems a tad less nose sensitive.