Technologies and racquet specs have shifted somewhat over time since the HEAD i.S10 was introduced so finding a very similar racquet might require some experimentation. I would encourage you to take advantage of our demo program (http://www.holabirdsports.com/demo-racquet-program)
to test some racquets out on the court. Our demo program is free; you only pay shipping, so it is definitely a great way to get a good feel for racquets you are interested in. The i.S12 is actually a pretty good start as the specs are similar to your i.S10. You might also want to consider the HEAD Ti.S6 (http://www.holabirdsports.com/tennis/racquets/head-ti-s6.html)
or the HEAD YouTek Graphene Instinct PWR (http://www.holabirdsports.com/tennis/racquets/head-youtek-graphene-instinct-pwr.html).
The Ti.S6 is a very lightweight, powerful racquet that has been one of HEAD's best-selling racquets. The Ti.S6's specs are fairly close to the i.S10, so it's worth a shot. Within HEAD's current generation of racquets, the YouTek Graphene Instinct PWR is probably the closest thing to your i.S10 and it is worth a try. If you have any questions, or need assistance with our demo program, please contact us at (866) 860-1416 or firstname.lastname@example.org.
Answered on 6/11/2013 by Ryan from Holabird Sports