Still too many variables, such as what about inside skills? If they are all respectable as well the price could sky rocket. Also, what time during the season do you plan on buying it? What age?
I had a look at the TL just then, and I would say that if you want a player now, expect to spend 700k minimum.
Search the TL yourself by looking for 18 year old (or whatever age you want) and searching with the potential criteria you want and have a look.