if you have decent budget, the no compromise choice is surefire x400u
extremely long throw for a compact wml and the laser has decent range as well.
if you are on a budget, the olight baldr pro is very similar, has low and strobe modes, and is more affordable.
i bought this last year and i realize some members are going to have feelings about chinese products.
both are fine for HD use.
for duty and end of world, i'd have more trust in the surefire and it is made here in the USA.
i don't normally run the baldr on the p229, but i put it on so you could see the fit.
it is slightly longer than the surelight.
both wmls come with a "universal" rail insert for mounting that fits the sigs rails, as well as a picatinny insert.
both have controls that are easy to reach with your trigger finger or offhand thumb in with your normal grip.