I wouldn't be paying $400 for any Wendel Clark card. I've got his rookie and I think I paid 10-20 bucks for it. The best cards on the market right now are called The Cup by Upperdeck. The best card you could get him would be one with a jersey patch and an autograph....here's a sweet one on ebay...
http://www.ebay.com/itm/06-07-UD-Cup...0#ht_500wt_951
...the more colours in the jersey patch, the more expensive it is. Hope this helps