I don't think there's a lot of difference in the years. If you love your Series, you'll love your Defender more! I'm in my third year with my NAS 93, and I plan to take it to my grave.
There is no price established. High mileage 93 110s go in the $30Ks, low mileage go closer to $40. Mint -- well, sky's the limit. In the UK they give 'em away, tho.