Socket 754 is fine for gaming.
Socket 754 has a 1600MHz HTT, does not support dual channel, has limited core support, has little upgradability options, and supports slower processor.
Socket 939 has a 2000MHz HTT, does support dual channel memory configurations, supports close to every AMD core, has a vast upgrade path, and supports the fastest processors availible by AMD.
Intel C2D E6320 / AMD Athlon X2 3800+
Gigabyte 965P DS3 / DFI nF4 Ultra-D
2GB OCZ Gold PC2-6400 / 2GB OCZ Gold PC4000
eVGA 8800GTS 320MB / eVGA 6800GS 256MB
150GB Raptor / 74GB Raptor
2x500GB / 320GB
OCZ GameXStreme 850w / OCZ StealthXStream 600w