Well, lets see what you really need. BTW, I own 2 Forsters and the Sinclair modified Wilson. I have owned others, including file-type trim dies, so here goes.
Both the Wilson and the Forster will trim all of your cases inside of 0.001". The Wilson is uncommonly slow and better suited to small volume operations like, say, benchrest shooters need. The Forster is a tad faster and is probably better for average needs in that respect.
If you are trimming .223 cases for a case-shucker like the AR-15, then what you need is passably good results and in a hurry, especially if you intend on sitting there until all 2M are done. Get the Lee for this job.
If you are really flush, then get a Gracey powered trimmer; it is really cool and trims cases in a big hurry. I think that Dillon also has some powered arrangements.
No, get the Lee this time around. Minimum investment and you can throw it away if you don't like it and get something else.
File-type trim dies are slower than molasses in January and not that good.
Some of the other brands of end-mill type machines are prone to much length variation.
On last thought, get the Lee for starters.