It's a toss up; there's a pile of 1911 style semi-autos.
S&W 1911 45 ACP SS with target sights
, all the special options and custom grips is top of the pile, but there are 14 & 13 round Paras, SA, 2 customs, Remington, 4 Colts, Kimber, 16 round Para 40 S&W, and an 18 round
Para 9mm with little brother Kimber 9 mm.
Best caliber: 45 acp. Load a mild 185 gr SWC for bullseye, or a pin busting 255 gr SWC (45 LC bullet) with HS-7 and 24# recoil spring [works really great in compensated barrel].
40 S&W is ok because there is sooooooo much free range brass and 9 mm is easy for Mrs Engineer to cycle the slide.