hi
you could always take your old driver head to a ping shop and have your swing tested to find out what shaft fits you best for a driver and then have that fitted to your ping isi driver head, it would be cheaper than a new ping driver and the isi was used on tour for years by pros and some still have it in there bag, it is a very long driver and you need a swing speed of at lest 110 to hit a 7% driver well.
bill