Used to work in amongst this stuff and i rekon the tom tom mentioned above is better for navigation and theroad angel is better for cameras plus you can get the radar detector for the road angel. But the navigation on the road angel is pretty poor. Just my opinion tho i suppose.
Snooper S4 evo is a good one (speed cam only)... The new Snooper Sapphire isnt bad too - more user friendly.... can be got under 200