There is no best DLSR imho. A good photo/videographer can make use of a normal DSLR to produce good quality of videos/photos. But with a budget of 5k, you can get a Canon EOS 70D with 18-200mm kitlens already. Do research before purchase yea.

For laptop, you can consider Illegear Z5. It is quite reliable but you may wanna consider to upgrade the ram to 12gb or 16gb since you are going to do video editing. Since you have a budget of 5k, you can also consider to upgrade the HDD to SSD. Will definitely boost the laptop performance.

Have a look. Both models are below 5k.
HP ENVY 15-ae014TX Laptop/ Notebook (i7-5500U, 1TB, 8GB, 25GB SSD, NV GTX950M, W8.1)
13-inch MacBook Pro with Retina display (LED-backlit Retina display, 3.1GHz dual-core Intel Core i7 processor, 10 hours battery life, 1TB, 1.58 kg)

Movie maker is very simple and lacks of awesome features. For instance, it does not offer nearly the amount of editing tools that it could. Because you can only have one video track, you are unable to use alpha channels or green screen footage in this program. As a result, you are creatively limited to the effects already installed in the program. Moreover, there are complains about the software that crashes a lot. Hence, it is a very limiting software, despite the fact that it is easy to be used/mastered.