I don't have any experience with the plastic boats but I am familiar from my own research. Everyone I've seen talking about the pond prowler has been happy with it. The sun dolphin is similar in design. I imagine the pelican isn't much different in size/shape...so it all comes down to features I guess.
last year I was asking the same questions though...I wanted something really easy to deal with, SAFE, small enough to handle solo and fit into the back of a truck, but could take an electric motor...and was not a kayak.
I ended up going a different route and picked up an 8' Livingston for $100...it only weights 100lbs and they're readily available dirt cheap and they're much more stable IMO. I spent the $$'s to get it registered so I can put a gas motor on it if I want, but you don't need to register if you're only taking it on lakes with no gas motor larger than 10hp.
I picked up a harbor freight 8' trailer used and completely rewired it and replaced the bearings and added a hitch jack and spare tire/mount, kitted the boat out with a 50ah batt box, dual scotty pole holders, fish finder, oars, transom wheels and an anchor system. I need to figure out a decent chair setup for it but so far I'm really pleased with how it's turned out.
I think I've got something like $1500 into it all told, including licensing for boat and trailer and it's ready to travel. I've got Kokanee dreams.
I grew up rowing a 12' boat around the river by the house so it's what works for me.