I suspect I may be no help at all here but I will add my tuppence worth, kilns are fairly cheap to run, check our frit happens or lampwork etc for a rough sum to work out how much they cost.
There are things to consider, you will want a bead door, will you want to fuse, if so then youwill need one that you can safely block the door to retain heat, there is fibre or brick to consider too.
I have a jen ken, its a fair old size and can be used for fusing too, you will need a digital controller, its no use trying to save money and getting a cheap kiln, that controller will save you a LOT of headaches down the line, the wider the door the more beads you can get in, and believe me as time goes on you will fill that space with no problems at all
I imported mine from teh states a few years ago, the pound was strong and I could get it including customs charges for less than half the price of one over here, they made it to order and uk electricity specs.
Have a good think about what you will want it for and go from there
