Daxter,
As you know in going from the stock 15" wheel to the 17" you are also going to need new tires. You might check Billet Specialities as they have 4 different styles of European type wheels that are appropriate for the Pantera. BS makes their own wheels. If you go with the 17" wheel you need to be careful in choosing your wheel backspacing.
The 3000 you mentioned is as low as you will find for new wheels and tires.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.