It’s really down to you, but in answer to your questions; yes, the inspira range do have a lower rate of capsular contracture and rupture. As for the US I’m not sure if the CUI’s are allowed there anymore; if they are still using the old style silicone filler then no, but if they use the ‘gummy bear’ filler used in the inspira implants then yes.
I had to have the inspira’s as the standard CUI’s stop at 525cc’s but even if I had smaller implants I would have probably chosen the more expensive option. But that’s just me. Mine are really soft already even at 3 weeks and men have said that they don’t feel much different to real boobs.
If you do want to upgrade then I would do it as soon as possible as the inspira’s need to be specially ordered in, this video explains the technology of implant fillers: http://www.youtube.com/watch?v=9vFyAEgqJSw
xxx