I think that the Elise structure is actually pretty good in a crash, just not to repair, the whole ali tub deforms. A friend survived a pretty horrific 50+40 head on crash in an Elise.
GRP is a quite a good energy absorber, but it doesn't look too pretty when damaged and costs a whole load to repair. The GRP used in the VX and the Early S2 Elises is also really thin compared to the S1 Elises.
I really fancied a VX220 Turbo, but when looking for a new car this time round I went with a bit more comfort and practicality.