25 Base Set (Shadowless) cards with current prices, from most to least expensive; the most valuable raw card is Charizard 004/102 ($1,063.80).
Blastoise 002/102$900.63
Venusaur 015/102$493.15PSA 10 $10,387.15
Alakazam 001/102$325.07PSA 10 $10,951.64
Mewtwo 010/102$296.58PSA 10 $14,235.71
Raichu 014/102$246.08PSA 10 $4,081.64
Nidoking 011/102$178.39PSA 10 $1,608.15
Ninetales 012/102$173.71PSA 10 $15,453.83
Clefairy 005/102$170.53PSA 10 $17,086.61
Poliwrath 013/102$159.45PSA 10 $5,528.02
Zapdos 016/102$147.92PSA 10 $12,775.35
Gyarados 006/102$117.87PSA 10 $3,140.42
Hitmonchan 007/102$104.27PSA 10 $2,514.46
Chansey 003/102$96.29PSA 10 $9,347.38
Magneton 009/102$84.70PSA 10 $7,021.08
Pikachu 058/102$48.89PSA 10 $2,856.91
Wartortle 042/102$38.40PSA 10 $311.25
Magikarp 035/102$27.07PSA 10 $612.31
Bulbasaur 044/102$24.26PSA 10 $369.49
Charmeleon 024/102$21.53PSA 10 $251.27
Ivysaur 030/102$18.73PSA 10 $455.39
Clefairy Doll 070/102$12.87PSA 10 $408.81
Computer Search 071/102$9.56PSA 10 $163.27
Super Energy Removal 079/102$9.13PSA 10 $147.29
Pidgey 057/102$5.19PSA 10 $215.90