Springfield's XD45ACP looks like it would fit the bill nicely. High capacity but avoids the problem of Glock's 45ACP grip(which is too large for a lot of people.)
http://www.springfield-armory.com/prod-xdpstl-45acp.shtml
I have an XD-9 and love it. It is my daily carry weapon. I'm going to sell a couple of old guns to buy an XD-45.
+1 on the XD. Looks like HS Arms-errr...Springfield got this one to market just in time.
I carry a 1911 every day and love it, but an XD in .45 Auto is mighty appealing.