I'm in a similar situation as you Sinaran having only a mid size car for transportation. I bought an 11' acquamarine with airdeck and am very happy with my setup. I have a 40lb electric trolling motor and a rod holder attached to the wood bench. I've been out at least 25 times with no problem. I can pack everything in my prelude trunk, including inflatable, motor, rods, battery....If you're the only person to be in it you can go with a 9' one, but I'm with my son so need a slightly bigger one. I don't think they'll ever quite compare to a regular boat, but for me that just wasn't an option. I'm happy with it...plus you can launch the thing in places you'd have much difficulty with a regular boat. If you wish you can put a larger gas engine on, but again that takes away from the portability of the whole package.
Just my two cents
ps. I also had looked into the seveylor type dinghy's and decided against them. Big difference in the quality, material, safety, in my opinion.