2 things. First, 720 native and 1080 native definitely don't look the same, the difference is fairly noticable, and secondly, those plasma TVs definitely aren't 1024*768 as that's a 4:3 aspect ratio and they're 16:9.
Other than that, go with whichever one is on offer I guess. We have one of those silly Sony smart TVs and the picture on it is pretty great, and it didn't cost that much.
E: Also I can't work out what currency this is, I assume South African rand? And if so, holy fuck TVs are expensive.
E2: Nevermind I finally found something, Rupees. TVs are about normal price lol.