My first .40 was a CZ 40B (back when you could still get one new, and they were selling for $299). It was before I really warmed to .40S&W and I stupidly sold it. A LNIB CZ 40B at a reasonable price is definitely now on my 'want' list.
I also had a SIG P229 in .40 which I loved. Unfortunately, one summer (at my old teaching job we did not get a summer paycheck) I had some unexpected expenses and my summer money ran out and I needed the money more than the gun. I decided I didn't need 2 .40s, and the SIG would definitely bring more money than the Taurus (below). Now another SIG P229 has been on my 'want' list for years.
My 2nd .40 was a Taurus PT140 Millennium Pro. It started my like of .40S&W. It hasn't worked in many years, I really do need to send it in for repairs.
I currently have, and often carry when in a state where I can carry, a S&W M&P40c. I love that gun.
On my want list (other than replacing my long gone CZ 40B and SIG P229):
-SIG P239, Kahr K40, Kahr T40 and Springfield Armory EMP. I'd really like them all, but they are all metal framed, old school, single stack .40s of roughly the same size. Though, I've wanted them for 10-15 years. I can see maybe eventually ending up with 2 of the bunch, but I doubt I'd get all 4.
-Glock 23 and/or 27
-Just about any future defensive purchase in 9mm will also be considered in .40S&W.