For perfectly consistent slices and juliennes, a mandoline slicer is a great tool for every kitchen. Ideal for shredded coleslaw, cucumber ribbons or perfect radish disks it is an extremely versatile tool.
They range in price from $30-$100, so it really just depends on your budget and taste.
Mandolines are available in either a plastic or all-metal frames with a variety of blade types - straight, v-shaped or diagonal steel blades. It is up to you if you prefer the handheld or the ones with the fold-out legs. The handheld versions are great for holding over bowls or plates and the ones with the fold-out legs I find are more stable. They all come with safety guards to keep your fingers safe. If using the guard is too awkward you could try using a cut-resistant glove.
I would choose one that allows you to easily adjust the thickness of your slices and one that has a julienne attachment as you will find it much more versatile.