I'd get a Camaro if you are after LHD. The LS3 engine is spectacular.
But......and I bet you knew I was gonna say this!
£20k for a low milage excellent condition VXR8 with the LS3 engine.
You get RHD, slushbox if you want one, 440bhp from a big daft V8, and lots of super saloon cool.
Factor in £1200 for a custom exhaust with cut-outs like I had and you still have change from £30k
With that, you could SC it with a Magnasun supercharger for £7k fitted.