Great car the Evo, but all depends on what you want from a car...
You seem to be gutted about the possibility of paying out £500 on the Clio, but the servicing, insurance, and running costs of the Evo will make you cry.
Also worth thinking about the practicality of these types of cars.. I personally would be scared to park it anywhere or infact drive it anywhere as I know the temptation to blast it woudl be too great.
On the plus side it will wipe the floor with the clio build wise, and the chances of anything going wrong with it are slim (as with most japanese cars), but if/when it does happen bills will be pretty expensive.
If you have the money, and don't care about practicality go for it!