A Lee Loader will probably work for you, but getting fold crimps to hold can be fiddly with some hulls. (Warming the plastic before crimping helps it 'take a set'.)
A roll crimp with over-shot card is definitely better in the peace of mind department.
That, however, requires an additional tool and more materials.
A better tool would be the Lee Load-All, in my opinion. (Original w/ cast metal base, or Load-All II w/ plastic base -- there isn't much difference between them.)
The Load-All gives more consistent and more reliable crimps, and sizes bases better than the Loader. Primer seating isn't as sketchy as with the Loader, either.
I have all of the above mentioned in this thread.
There's a Lee Loader (12 ga) that I got cheap because it was seized from rust. After some oil soaking and gentle persuasion, I broke it loose, cleaned it up, tested it, and shoved it in a drawer (where it still remains). Works fine. I just don't use it. An couple sockets, dowels, and a hard surface to seat primers on is just as effective (as long as base sizing is not needed) ... and often easier to use.
There's a Lee Load-All (12 ga + 20 ga conversion). Bought it from the original owner and I've loaded a few hundred oddball loads with it. Easy to set up. Doesn't take much space. Clamp it to a bench or table when needed. Store it out of the way when not in use.
And there's a MEC 625N (12 ga) that I picked up at an auction for pennies on the dollar because it was disgustingly filthy, grimy, sticky, gooey, and covered in powdered cow and horse feces (it was stored in an open barn).
I tested it once after blowing it apart for a deep cleaning (after pressure-washing). It gathers dust now. When I feel like putting something together, I grab the Load-All.
Oh... And I have BPI roll crimp tools for 12 ga and 20 ga (used in a drill press). Combined with a home-made hull trimmer, those roll crimp tools allow me to load pretty much anything.
