I also had this issue. I hope you got it worked out.
I've been using Corbis for a while and I've never had any issues with them.http://squaretyre.com
I'm a big fan of the BMPCC personally. You can get it pretty cheap nowadays too. Just bare in mind all the extras you'll need.http://thesportbriefing.com/badminton/best-badminton-racket-reviews/
I'd always use a desktop over a laptop personally. Laptop's are so damn expensive for such little specification.
I'd go with the a7s definitely.