thanx for the replies
Wouter: the wind speed around here ranges from about a min of 4 knots to a high of 15 knots.
I've thought about a spi and it sounds like a lot of fun but I havent really used one and no one here does so Im worried that Id be lost if I get it plus id be sailing alone and I dont want something too complicated.
There is no doubt that a Shadow would really work for you.
It is light, has a small easily handled spinnaker and you won't have to lower the mast after every day's sailing, which you should do with a carbon mast to avoid delamination.