My response would be 9 mm vs 45 ACP. Skip the 40 S&W you will NOT like how it shoots. I have sold both of mine and purchased another 45 ACP.
As to supply and demand, you could try getting a Bersa Thunder 45 Ulta Compact Pro, you will really like the way it feels and shoots. 1911's are nice but sometimes fussy as to ammo and reliability. (mag problems)
Try one of these and you will be happy.