I bought a BenQ g2420HD a year back and haven't looked back. It's got a headphone out jack that I plug in wireless speakers to. It's a great, cheap, not too small and very low lag monitor.
I played a bit of SF4 on my big screen LCD the other day after playing some other game and I couldn't believe how laggy it felt, I didn't think I'd even noticed the difference. Once you move over you'll never look back. My timing also feels the same as at the arcades (although obviously not to online for obvious reasons).