good handling?

[Niall]

Brakes on a 6, providing they are in a good standard are plenty enough. As mark says, out of everything, don't skimp on tyres. No point in spending thousands on suspension only to have a set of tyres that don't grip. It's pointless. I'm going for Michelin pilot exaltos 2s next. I've got t1rs at the moment and they grip well but the car can corner much faster than they can handle which isn't good news....unless you like under steer which I don't!

If you really want to get deep into it, a cage is a good idea for stiffening the shell and maybe start having other bits of bracing welded in but that's all a bit excessive for road use.