How much roughly should i be paying for a standard s14 silvia? Dont know much about this aul craic but i want one.

How do u find the difference is yen to pounds, i go on to alot of japanese importing sites and all the prices r in yen so i havent a clue how much they r?? how does the whole thing work if i want a car took back, is there duty and all to pay or wat??