Great traders/buyers/sellers I've dealt with:
Captain Yoshiro, Neo-Jorge, Ventrra, Keir to the Nth Power, Geelw (many great trades!), GaijinPunch (TONS of awesome deals!), Carnage6, Jaydub (many excellent deals!), kevincure, Chunky (great trader, tons of awesome deals!), congobongo (great trader here!), buttasuperb, RJ, Natureboy, Bighab (lots of awesome trades!), portnoyd, edsongodoy, Kaine23, Achika (lots of great trades!), punkoffgirl, leonk, Crazyimpmon, TRM, MarkM2112, Sylentwulf, Li Wang, Boboduo, le geek, Darth Vader, cudwortho, mmpoole, Bratwurst (multiple deals!), Samudra, dsullo, ddockery, ianoid, NESCollector75, AdamG (amazing trader!), Ronfar, autobotracing, Funk Buddy, video_game_addict, ventrra, Odin, The Unknown Gamer, ClubNinja (multiple trades!). vision89, 98PaceCar, chadtower, junglehunter, Soulblazer, jonjandran, kevdeeshields, sisko (TONS of awesome trades!), goatdan, KirbyStar27, Queen of Felines, brykash, digdug, Atarian75, DDCecil, shanonw76, Classicgamesdepot, Mac-Abre, Flack (multiple trades!), SegaAges, youruglyclone, HaggarCodyGuy123, NeoFreak9189, Dire51 (he's the MAN!), le geek, EdOscuro, gamergary (multiple trades!), udisi, ArnoldRimmer83, buffquinn, DDCecil (multiple trades!), ScottK, Querjek, ddockery, dj898, testament89, krazynesphreak (great trader here!), Qunitracker, k8track, rhiohki, axekiller, Goodwill Hunter, dojosky (many great trades!)
Great buyers/sellers/traders from the neo-geo.com forums
droid, Capcomfanconverted, T_Smallz, Jediwarrior, Shred, PUNJABEE, norton9478, gmw, Eric, blipper, dojosky, Dougdesensei, Sesshomaru, Dazz-Kyo, Force, games91999, redrum666, D-Lite (multiple deals!), Bob Sagat, whitey, Hentai Sama, Shin9999, Galford Forever, qube, BIG BEAR, prosper1ne, RiotoftheBlood, Metal Slug, Solid Snake, ckchan, Fei, Steve, Orochi Iori Yagami, leepantalone, Kenshinsama, weezer0302, neo1087, rarebucky, SoloFenris, Tsuyugasumi, k'_127, G8Keypur, Cnidarian, FeelGood, Cole, G8Keypur, Verbatum, Hikaru Ichijyo, James Morgan, Gamefan, Freelancer, Shining Kooksu, Brittney, B.I.GPSYCHE, Bluevoodu, Ghost Dog, Nick Gorake, Buttasuperb, Shadowland, Jennety, Oceanfrr, DARK ANDY, Daffy Duck, The Chief, Neo-Jorge
Great buyers/sellers/traders from the shmups forums
sala-man, Eight Rooks, bcass, fuchioma-x, Craig, cl25, thesuperkillerxxx, Skyline, Click Stick, angrycoder, Matt, drohne, Prince Nemo, Tar-Palantir, Mr Longhair
If I forgot anyone...sorry!