Depends what you want to achieve.
If you want the best handling you can get then fully polybush, but you will also need to fit some really good coilovers or spring/damper kit.
Bilstein/Koni/Weitec are good makes and do both coilovers and kits.
You should have adjustable rate dampers as you can then set the ride to how you want.
However if you set the ride soft the car will bounce, if you go too hard the ride will be harsh.
Decent coilovers/spring kits will cost you £500 plus, usually about 700.
You should also think about uprated anti roll bars.
You are now in for at least a grands worth of gear and if you cant fit that lot yourself another few hundred quid to pay a mechanic.
So now do you really want to buy polybushes?