Rack recommendations

i'm in the market for a rack. would prefer about 5-6 shelves, with wheels. i've looked at Pangaea, VTI, Salamander online. local dealers carry the latter. i just want something that's 1) deep enough for my amplifier and 2) relatively easy to move around (hence wheels)

are there other brands at similar price points that i'm missing? also, in your experience, do racks even make a difference to the sound? i'm a little skeptical but willing to be educated