OK, since we're plugging stuff.... I've tried Total Commander and a heap of other Explorer (+++) replacements, most of which are long, long gone. Some have been crap, some OK and some, like TC, quite good, but every one has completely paled in comparison with
Directory Opus from GP Software. It's been around since my Commodore Amiga days (not sure if I came across it while using the 500 or 1200 though), has steadily improved, and the current iteration is simply astounding in its awesome versatility. It has also always been 100% stable (for me anyway) for as long as I can remember, which is no mean feat in itself given the amount of functions it has.
It's priced at AU$85 for first-time purchasers, but upgrades are free within major versions (e.g. V.9.00>V.9.99) and upgrades between major versions (e.g. V.9.99>V.10.00) are heavily reduced for current owners.
I really can't recommend it highly enough.