Hello RG,
VT-Speedster is much faster than VT-Allrounder being a flying wing. As you told you are a beginner I would suggest you to go for VT-Allrounder beginner version to start with. Learn flying and building through it and then you can move on to whatever you feel like. And yes
www.vortex-RC.com is one of the safest website to shop anything related to hobby. You'll get best support and experience here.
Also, I would recommend you to buy a computer simulator before to learn flying.
Thanks and regards
Utkarsh