Wow, thanks for all the responses!
Ok looks like the cost inhibits doing this, I understood the shifters were expensive but finding a cheap second hand pair is almost impossible, I also realised I'd have to replace the crankset on my sirrus adding more cost!#
I will keep this option in mind but I think it will be easier if I just buy a second hand racing bike instead!
This way I will have more of an idea of the type of bars/bike setup I need. Cycle shops really should allow you to rent bikes for a day and allow you to do a 60 mile ride, I would have made a more informed choice back in 2008 (now too)!