the m88 seems to very quickly give you a deep sounding floor tom by positioning it in the pointing at center, 3 inch up off the edge of the rim position. standard position really.
i really like the oktava 319 on floor tom, as with the CAD condensers in the e or m series (i have tried both the e300 and m179 with success, perhaps the m179 is a little better because of that dial in pickup pattern). most LDCs will give you a pretty good picture.
also, i like using an earthworks omni right up on the shell, like 1/2 off it. sounds really cool, but be prepared for a bit of quiet bleed.
frankly the 57 makes good floor tom mic too, with a little eq.
oh and a 441 sounds great as well.
geez, so many ways of dealing with a floor tom... if you have a cool omni, try that shell mic trick though.. it sounds pretty cool...