While not quite as tall as you (I'm a mere 6ft3), I too have issues getting comfortable in sports cars. I suppose it depends on what you want from a sports car. You could go for a hot hatch like a Focus ST or Octavia vRS which has plenty of space but if you want a 'true' sports car like a two-seater, you may be more limited. Porsches tend to have good space and plenty of seat adjustment so an early Cayman or a Boxster may suit. Similarly, an Audi TT could be worth a look. German cars tend to have more space than French or Japanese when it comes to sports cars.