Hi Steve,
In the (distant) past I did make a hive but in all honesty because of the accuracy required I would recommend purchasing a hive in the flat and assembling it yourself.
Regarding the type of hive to go for, to me there is only one I'd recommend in the UK and that is the Modified National. In my experience it is the most widely used, not only for beginners but for experienced beekeepers alike. There is no reason to change as you move from novice as you gain experience.
If you are looking to purchase additional equipment at any time in all probability it is the National you will see advertised.
Hope this helps
Pete