Welcome to rib.net. What usually happens these days is that some unsuspecting newcomer such as yourself poses an innocent question such as "which rib should I buy?" and all hell breaks loose!
Search the forums here and think about what you want in terms of style of boat, useage etc as per DGPW's posts.
You are correct that RIBEX is cancelled for this year. Two options for you 1) Check out the cruising forum and the "North West Ribsters" thread. Lots of people in your area who should be able to help out. Even think they have regular meet. 2) Come down to Plymouth the weekend of 10th/11th May for the 1st ever RIBNET gathering. (See inaugaraul rib.net conference thread.) Lots of peeps there with different types of rib for you to look at.
Oh yes and I give it about 30 mins before Manos offers to sell you a South African built Falcon RIB for your budget.