I like the Hobie Trolley because it have a bungee shock cord in the kit. The Yak gear deluxe trolley is good to. I actually bought it then saw the Hobie and bought the parts to make it like the Hobie. I also just put the hobie on my GF's boat. The hobie also comes with the longer well nuts which hold better.
To me those flat side boards beg for some gear track. You could leave the mount where its at or seal the holes and cover them with the gear track. With the gear track you can use something like the scotty gear head or make a adapter for the regular mount. I made the adapter for the front because I found it to be a pain to have to twist the gear head every time I wanted to turn the rod holder. With the regular mount you just lift the rode holder twist it to where you want and push it back down. I put the gear heads behind me since I don't move them.
I wouldn't bother with the extra paddle holder unless you are going to put the anchor trolley on the port side.
You might think of getting some kind of flag to help the power boats see you.