dont know ya budget or what ya got planned for the car, but for a good set of seat covers you prob lookin at around 40-60 quid and you could get half decent buckets for like 100-150..could be better doin it that way :S
also you could get the seats retrimed chap if you look around you could get all the seats done for around£200-400 ive heard of places that do it cheap just look about mate