I am fairly new to reloading too and did alot of looking around and bought this....
World's Finest Trimmer 2 at Little Crow Gunb Works They make one that is caliber or case specific (WFT), but the WFT2 has interchangeable inserts but you will also need a 1/2" chuck drill. I'll be quite honest, I have not used any sort of case trimmer before and I have not used the WFT2 (with 300BO, 300WSM, 338LM inserts) that I bought yet. But it seemed like a great design, less work turning one by hand, easy to use for multiple calibers (WFT2). You do need to have a "master case" with correct trim length to set your cutter depth, then have at it with the cases you need to trim.
Just something to consider if you havent seen it yet or already ruled it out.