Cougar 500k vs genius gx manticore or others

I'm looking to buy a new keyboard but i'm on a budget, so far I have been looking into getting either the cougar 500k or the manticore but i'm leaning towards the cougar 500k even though i can't find a good video review of it anywhere. If anyone has any other suggestions in the price range of the ones mentioned above with similar features i can look into getting those but unfortunately my max price is $87-$89, i know not a lot of breathing room but that's what i can budget and my current keyboard is not responding anymore.