I am not a big believer in having the latest technology, as I am having technology that works. Having said that, there is a lot of buzz about the T-slim and the Accu-Chek pumps. Both new to the market, and have a lot of bells ans whistles on them that make them attractive. Were it me choosing a pump, I wouldn't choose either, because of some things that are either not yet completed, not yet approved, or not yet reliable. For example, there is not tracking software approved for then T-Slim, and I am not fond of having to recharge the pump daily,versus changing a AA battery once each month.
Having said that, I use an Animas Ping. I like the software, the ease of operation, and the fail-safes built into its program. It meters down to .25 unit administered, which works well for me. I like the food dictionary and the nice colour screen that works well for my eyes. (My eyes are old!) The meter and the pump communicate nicely with each other. The Dexcom 4 is supposed to be coming soon, with a pump interface and upgrade at a very reasonable price. Customer service is decent, training and support are superb, and the machine is easy to fill/service and the infusion sets that were recommended for me work well. Please understand that I am old.
Something to keep in mind, your daughter, now eight will be a young teenager when that pump will need to be replaced. Her insulin needs are going to change dramatically in the next few years, while using that pump. With the Ping, it is very easy to adjust basals and Insulin/carb ratios. The Ping is waterproof, durable, and can be decorated to her liking.
Were this me, I would go with proven tech, and let the new pumps run their course for next time. The last thing you need is a hardware problem just before her first Choir concert.
Good luck with your choice. Be well.