A good set of one-on-one ladder maps are provided by iCCup (used in most Korean leagues). As of season 7 these are:
Andromeda 1.0
Athena II
BlueStorm 1.2
Byzantium II
Carthage
ColosseumII 2.0
Destination 1.1
Faoi 2.1
Gaia
Hannibal 1.1
Hunters_KeSPA 1.1
Hwangsanbul 1.2
Katrina_SE 2.0
Longinus
Lost Temple 2.4
Luna the Final
Medusa 1.1
Neo Requiem 2.1
Odyssey
Othello 1.1
Peaks of Beakdu
Python 1.3
Return of the King
RushHour 3.1
Seongangil 1.1
SinChupung Ryeong 2.1
Spinel Valley III
SwordintheMoon 2.1
Tau Cross
Tears of the Moon 1.1
Vampire
Voices IV
Wuthering H
Yellow 1.1
Zodiac 101An overview of all standard maps (distributed with StarCraft original and/or Brood War) allowing 5 or more players.
Ebon Lakes.jpg)
(5) Ebon LakesIsland Hop.jpg)
(5) Island HopJeweled River.jpg)
(5) Jeweled RiverLake of Fire.jpg)
(5) Lake of FireRosewood.jpg)
(5) RosewoodSandstorm.jpg)
(5) SandstormSherwood Forest.jpg)
(5) Sherwood ForestTwilight Star.jpg)
(5) Twilight StarAcross the Cape.jpg)
(6) Across the CapeAftershock.jpg)
(6) AftershockAvalanche.jpg)
(6) AvalancheAzure Plains.jpg)
(6) Azure PlainsCauldron.jpg)
(6) CauldronClose Encounters.jpg)
(6) Close EncountersCrash Sites.jpg)
(6) Crash SitesCrazy Critters.jpg)
(6) Crazy CrittersFlooded Plains.jpg)
(6) Flooded PlainsFuneral Pyre.jpg)
(6) Funeral PyreGround Zero.jpg)
(6) Ground ZeroHidden Shrine.jpg)
(6) Hidden ShrineHypothermia.jpg)
(6) HypothermiaNew Gettysburg.jpg)
(6) New GettysburgRiver of Light.jpg)
(6) River of LightSapphire Isles.jpg)
(6) Sapphire IslesSirocco.jpg)
(6) SiroccoTale of Two Cities.jpg)
(6) Tale of Two CitiesThin Ice.jpg)
(6) Thin IceValley of Re.jpg)
(6) Valley of ReBlack Lotus.jpg)
(7) Black LotusBroken Steppes.jpg)
(7) Broken SteppesNightshade.jpg)
(7) NightshadeRiver War.jpg)
(7) River WarBridge to Bridge '98.jpg)
(8) Bridge to Bridge '98Char Magma.jpg)
(8) Char MagmaDark Continent.jpg)
(8) Dark ContinentFrozen Sea.jpg)
(8) Frozen SeaHellfire.jpg)
(8) HellfireHomeworld.jpg)
(8) HomeworldJungle Rumble.jpg)
(8) Jungle RumbleKilling Fields.jpg)
(8) Killing FieldsOctopus.jpg)
(8) OctopusOrbital Death.jpg)
(8) Orbital DeathPlains of Snow '98.jpg)
(8) Plains of Snow '98Primeval Isles.jpg)
(8) Primeval IslesRiver Runs Through It.jpg)
(8) River Runs Through ItStation Unrest.jpg)
(8) Station UnrestThe Hunters.jpg)
(8) The HuntersTheatre of War.jpg)
(8) Theatre of WarTribes.jpg)
(8) TribesWheel of war.jpg)
(8) Wheel of war