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This isn't for a trade, but to help remedy your lag, you can open task manager and set the affinity of steam to 1 core if you have a multi-core cpu. The only problem is that afterwards, you have to set each game back to multi-core when started with steam since it starts them with single-core since steam is single-core'd.
I have
○ Borderlands: Game of the Year;
○ Mafia2;
○ Killing Floor Bundle;
○ Painkiller Complete;
○ L.A. Noire Complete Edition;
○ Half-Life;
○ Half-Life 2: Episode One;
○ Plants vs Zombies GOTY.
BTW. I rearely use steam because of lags that it causes for my pc.