I had a few locked up in the house, and I've taken the time to take some pic for you.
HK USP compact and fullsize
XD-45 compact and two fullsize XDm 45s
I would include an Glock 21 and 30 but my Glocks currently on hand are only in 9mm and 40S&W.
The only other worthy 45s I can think of happen to be the Beretta Storm, FN 45, and the M&P45. There is an Ruger 345 but I find the P-series to be less than desireable from my experinace. Basically you get what you pay for.
If I were on an budget and wanted an 45 for carry and home defense I would be happy with an Glock 30, M&P45, or XD-45compact. Any of these will work. I think the sigs and HK's are a bit lofty in price for someone looking for an budget firearm.
Oh yea. The 1911's, if that's your thing go for it. Im just not all that into them anymore.