ClassiPress has a number of different pricing options, so you can charge either for: Fixed Price Per Ad, Price Per Category, % of Sellers Ad Price or Charge for Featured Ads Only. There is also a Membership option which allows you to charge $x.xx for an unlimited amount of ads for xx days (as per your settings). You can set ad pricing packages, but featured pricing is not part of the package itself and appears as a separate optional price. There is only one featured price option.
So, whilst yes you can set differently priced ads for various durations, this is not specific to featured ads.
Vantage also allows pricing packages, but not yet capable of memberships/subscriptions. Thanks.