Advice will be easier face to face, if you are going to Blackpool, look me out on the benches. I will be showing Woodella Northern Delight of Jisgard. Blackpool should be a great place for you to look at the breed and it is a debut show for many of the current crop of puppies. Windsor Championship show is on the following Friday if that's any closer for you. Let me know if you need any details of these shows or others.
It will help to buy a catalogue at the show (5.00 pounds on the day at Blackpool) and then you will be able to match up names you know from the forum or web etc. with numbers on the benches and the exhibitors and breeders owning the dogs.
My advice is to place an order early with a breeder you are happy with as very few litters are bred per year. There were only four litters that I am aware of in the UK when I was looking in December 2008 and breeders will hold back on their breeding plans until they have firm orders.
In my opinion the temperament of the breed is better now than it has ever been in the past. If you are looking for a pet this will be of optimal importance, but you should also familiarise yourself with Fanconi syndrome in Basenjis and only consider breeders who screen for this condition. There are only a few people who do not and the tide is turning. In my option it is just not worth the risk of loosing a young dog to this condition when we now have the tools to avoid it and eradicate from the breed, so please ask this about this, before selecting a breeder.
If I can be of any be of any further assistance I am happy to help.