I'm currently running an NA auto which i've owned for 2years and i love her to bits.(more than my girlfriend she'd tell you)I went for the NA for insurance reasons cos i'm a young 'un but its by no means a slow car.Its pretty much the same as what your looking at, 18" rims body kit,HKS pipe etc. and its a real headturner.
Theres also a few turbo kits available in the state for the NA, although im unaware of anyone in the uk converting one but your looking at around $5000 for 400bhp which isnt bad at all.
But as most have said.it really depends on what you want the car for.If you want looks alone, the NA will be your car.