Actually, the Radical is street legal everywhere but the US. The single lap street car record for the Nurburgring is held by a Radical.
Now if the T1 actually gets built it may be street legal in the UK/Europe, but I guarentee that car will never pass DOT regulations for street use. Unless they release a version that's about 6 inches higher off the ground and put bumpers and airbags on it.
As far as the pricing... in the US a Radical SR3 costs around $75,000... the SR4 about $50,000. And I wouldn't need a V8 SR8 to run circles around some rich dude in his toy, all I need is to lift his gearbox off the ground once, and I guarentee he'll stay out of my way.
Regarding the price of the SR9... considering it's a purpose build Le Mans Prototype 2 and all, I'd say $300,000 is dirt cheap compared to something like the Porsche LMP2 car that I'd guess costs at least twice as much:
