Base Set - complete (my charizard, raichu and ninetales holos are in poor condition though)
Jungle - complete (nearly twice infact, just need another jolteon and vaporeon)
Fossil - All but Gengar (holo version)
Sandstorm - All but Armaldo, Solrock, Aerodactyl ex, Kabutops ex and Raichu ex. (I had a Raichu ex but it went missing mysteriously...)
Sandstorm Reverse Holofoils - All but Armaldo, Cradily, Dusclops, Jolteon, Lunatone, Sableye, Solrock, Espeon, Umbreon, Azurill, Spearow, Rare Candy, Wally's training and Multi Energy.
I've got most of Team Rocket, Gym Heroes, Gym Challenge, Expedition, Ruby/Sapphire, Dragon, Team Magma vs Aqua and Team Rocket returns.
Lately I've been going for the complete legend maker set, and have 76 of the 92 card set (plus box topper) so far. I only have 21 of the reverse holofoils from this set though.
I've probably got 1500 unique cards all-up. I've always been more concerned with collecting than playing though.