JD,
I have the ones you mentioned and IME - the zebras will run you the most $$$ if you find them under $75 it's a deal.
The zebras are the smallest of the ones you mentioned and if you manage to find them chances are good they will be small(1.5-2").
The blue phantom (L-128) is pretty cool looking but pretty elusive and mostly nocturnal, mine is about 5" after 2 years. They don't really eat algae - mostly carnevoirs as are the zebras. You should be able to find these at $25-40
The flash plecos (L-204) are surprisingly pretty , at 4-5" mine still have clear markings and are quite outgoing, these guys will consume algae and love zuccini , for success you will want to have driftwood in with just about all plecos but especially the L-204 will love to gnaw on it. Make sure you get the REAL L-204 as many places misidentify panaque maccus (clown pleco/L-104) as L-204. These guys can probably be had for $20 or under.
L-134 that Archangel mentioned are beautiful too but I have found them to be a bit tender and they are one that I take a long time acclimating to my water. They are not the easiest to find and usually run $35 and up.
BTW, if you get fish shipped overnight there is rarely anything to worry about - I have , many times. You may want to think about the weather though - I usually don't order anything during the cold of the winter or heat of the summer.
Also - be careful putting fish in with the pike, they will try to taste test any new additions.
Good luck.