Depends on the condition, but here's what they've been selling for on average on eBay lately (ungraded, near mint to lightly played):
Base Set Charizard (Unlimited Holo): About $130
Blaine's Charizard (Japanese): About $64
Expedition Blastoise (Holo): About $100
Light Togetic (Unlimited): About $38
Base Set Machamp (1st Edition): About $12 (not sure about the Spanish one)
Jungle Mr. Mime (1st Edition Holo): About $30
Legendary Collection Hypno (Reverse): About $35
Anniversary Pikachu (#39): About $4
Looks like the Charizards, Blastoise, and Hypno are your best bets when it comes to grading, assuming they grade high. Graded Charizard could potentially fetch around $400, Blaine's Charizard $150, Blastoise $200-300, and reverse Hypno $90+.