I will have to pick up a couple....I have done some experimenting with a studio set up and some light and I had lots of fun!! I guess I will want to eliminate shadows on someones face without fill flash if I am in that position...so I'll try reflectors.
IMHO, it is important in being a good photographer to not to apply a "blanket" technique to your shooting. Think about why or why not you would want to eliminate shadows on someones face in each situation, before just deciding that this is what you are going to do all the time. Everything you do to take the picture and make the print is going to affect what the print does emotionally, conceptually, and what have you. That is your starting point, not "I use fill for portraits." Light is your only seriously important tool. Use it to manipulate the image in order to achieve the desired effect, not just to make use of your tools for sake of making use of them. You must free yourself from predefined boxes to be a good photographer. You must go into each image fresh, and consider each image individually. Instead of worrying about gear and what situations you will use it for, think about light and what it does for the image...then think about what you can do to manipulate it to get the intended effect. I suggest that you quit getting so much into gear in your thinking, and really get into learning and thinking about light and how to use it. One thing I would do is to get some basic shapes. Sphere, cylinder, and cube. Get three hot lamps, a table, and a backdrop or two. Get some bounce cards and some black cards. Get some diffusion. Get some barn door material (black foil - A.K.A. cinefoil - works well). Then spend your time lighting those stupid objects in every way imaginable until you understand light and can control it to get what you want. Spending your time doing that will help your goals far more than worrying about what camera to use or what other people do with reflectors.
"Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."