I remember reading something about how some of the Superstar own brand rims are flexy as they try to save weight over stiffness, but I can't remember which ones in particular they were talking about. For under £200 I don't think you can go wrong.
I have some pave 28s on dt240s. I think they're pretty good. They're stiff enough for me to not notice any annoying flex, but I'm no sprinter and only weigh 74kg.
That's a good price. I paid nearly that much on CX Ray spokes alone for one of my wheel sets.