Sure, urlwolf... actually, it's difficult. It started in Windows 3.11 with FMStepUp (File Manager upgrade - added context menus and all sorts of useful stuff). Under Windows 98 I started experimenting with all sorts of File Managers - an early version of AB Commander was one of them (and the only one I can remember the name of). When I switched to Win2k I bought DOpus 6 and I've never really looked back. Being an idiot with money, I did buy DiskJockey 2000 because of its Stellent Viewers (the lunacy was in not realizing that there are much better File Managers out there that come with the same viewers for the same price, not realizing that I could buy QuickView Plus to get the viewers and finally doing this about 12 months before Yahoo! released Yahoo Desktop Search with the same viewers for FREE!). You know what they say about fools and their money... I like to think that I've learned my lesson, but am pretty sure that I have not...

as from there there followed giveawayoftheday acquisitions of Frigage 3 and AccelMan 3.6 (so no money lost), the purchase of XYplorer (courtesy of a DC discount), the purchase of ZTreeWin (during the summer sale), PowerDesk 6 for $9.99, and finally Total Commander.
PS Note how many DC members ARE happy Windows Explorer users - only one less than DOpus users! Also - my progressoin goes like this (to follow your format):
FileManager ->FMStepUp->Windows Explorer->DOpus.
In practical terms this is how things stand now (might change as I immerse myself in TC and XYplorer). Note that I still have FMStepUp loaded running on top of a WnNT 4 copy of winfile.exe!