If you can afford it, a Sig makes a good bedside, carry and range gun. I've got a 226 Mk25 in 9mm also a 220 in .45 ACP that's as accurate as I can hold. Both feature the DA/SA mode of fire, a concept that I've spent some considerable amt. of time learning. Basically, I'm a 1911 guy, but have to admit that Sigs are truly finely made guns, and their customer service if you have to use it, is 1st rate.
As to size and models...Sigs come in all sizes which allows you to personalize your choice to your needs. Both of mine have really good DA/SA triggers. YMMV.
You can also get most Sigs with a DA trigger mechanism or SA for that matter. It's up to you, but if I were in your position, I'd rent anything that appealed to me over the counter and that fit my hands.
One other good thing about the various models is that most if not all, have a .22 lr slide/barrel/magazine unit that you can buy, and then have the same trigger and grip size to practice for less than the cost of your business rounds.
Best regards, Rod
...................
DAO , DAK ( double action Kellerman) or SAO are available.........me I prefer the DA/SA models. At last count , 2 x P225 , 6 x P220 ( 3 in full size 1 carry , 2 SAS carry) , 1 x P226 , 3 x P229, 1 x P210 ......currently salivating over the new 10mm P220 but won't "pull the trigger" ( pun intended) on that purchase until the bring out a DA/Sa unit , prferably in " carry " ( 3.9 inch) length.
Yes I have other sidearms , in semi autos, 1911s , Hi-Powers and a coupla CZ 75s that said the Sigs get carried and shot the most , after that believe it or not it's round butt pre-lock Smiths ( think the Lew Horton guns) that get carried the most.