glock. simple, reliable, way more accurate than any of us is likely to shoot in a fight for our lives. it won't need a billion trips to the gunsmith to coax it to work right.
used to be all against the glock then i bought one and i realized what a great platform it is. when you stop trying to have the latest, greatest, century old pistol and you put aside all the ninja fashion, glock is the workhorse that gets the job done. sure, sig and h&k are excellent pistols but they cost significantly more. the xd looks like a great pistol too, though i've never shot one. i've heard they worked the bugs out of the sigma and it works fine now. my buddy has one and hasn't ever had a problem, plus they're a little cheaper than a glock. me, i carry a model 23. i feel it is the perfect balance of power, capacity and size/weight. it also fits my hand well. the other nice thing about a glock is it's gonna be hard for some jackass da to make you look bad by your choice of weapon because of the number of police departments who issue them.