The difference between neo and ferrite doesn't allow for a 4x10 cab to be carried up a flight of stairs by one person. In a 2x10 go neo all the way, but the difference between 60 and 80 lbs in a 4x10 is not so critical.
BTW I saw Peavey has a removable caster kit (casters and socket mounts) for $25, great price, and they're the same casters I've seen at Princess Auto in Canada for $4.50 a piece. Got the same on my 4x10, I roll it through anything (gravel, wet grass, snow, etc) and whenever they get chewed up I buy a new set. I'll take fresh casters over neo drivers any day.
SVP-CL + IPR 1600 + SWR Goliath III 4x10 = bliss