interesting car hire - barcelona area

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hi guys,

i'm heading to barca at the start of sept. for the 24H race. having been couped up on a project site for the past 3mths i'd like to get there early and spend some time driving around catalonia.

therefore i was wondering if there are any rental companies in that area who cater for something other than a typical holiday rental. thinking a caterham/elise/boxster type car or a classic would be ideal.

any ideas?