What is the best sidearm to buy?

Im already getting an HK Mp5, but for a side arm. I would like to become either secret service,fbi, or celebrity bodygaurd. The guns ive been looking at are A glock 22 with Glock tactical light 21; a sig sauer 1911 tactical with bottom rail and light; a berreta 92 fs with light if possible; or a s&w bodygaurd 380?