I'm in southeast Virginia. The 8000 is a 9mm. The 8045 is a .45 acp. Both have alloy frames. The 8000 has a slide with tapered sides (not sure of the proper nomenclature) that is suppose to lighten the gun. The 8045 does not have this taper. Looking at the guns, they look almost identical, but when in hand you can tell the 8045 is just slightly bigger in the grip and is just very very slightly longer in length. The 8000 weighs about 30 ounces and has a 15 round mag. The 8045 weighs about 33 ounces, has a rail and has an 8 round double stack mag. Both have the rotary barrel, three dot sights, and a safety/decocker. The also make an 8040 model, .40 S&W, non tapered slide and no rail. I've only shot about 650 rounds through each of them but have not had a single failure of any type with either one. I bought the 8000 at a local Bass Pro Shop and the 8045 was ordered through a local gun shop. Both guns are very soft shooting, the 8000 is softer shooting than the SR9 that I had. I really liked the SR9, but the grip didn't fit my hand nor the wife's, so after buying the 8000 I sold the SR9 to a friend.
http://www.stoegerindustries.com/firearms/stoeger_cougar.php