If you want a double floppy drive in your computer, make sure that its floppy controller can handle two floppy drives. On most computers made nowadays, their floppy controller can only handle one drive. If yours is like that, you might need a PCI floppy controller.
Just add a LS-120 as drive A, and the 5.25 as drive B. The LS-120 is IDE.
Hang onto that PS/2 drive. They die all the time; if you don't have a use for it someone else will.
Scythe (http://www.scythe-usa.com/) is a well known Japanses supplier of aftermarket (cpu)coolers, fans, fancontrollers and the Scythe Kama Cabinet: XDShow Image(http://images.hardware.info/news/Scythe_Kama_Kabinet.jpg)
And various usefull, and not so usefull accessories.
I've got a nice fancontroller and a 3.5" Floppy-drive/cardreader combo-drive (http://www.scythe-usa.com/product/acc/018/ye8v08_detail.html) from them.
What's the format support like on the floppy portion?
What do you mean? I usually only use it for more recent high density floppy's.
I could test it for you though.
Isn't that also based on what setting your controller is set in bios?
I recall seeing the option to choose high density or normal on the various boards I have used.
Maybe only more expensive controllers can handle both so manufacturers leave it out?