You can get 7 and 8 shot .357 revolvers. I have a 7 shot cut for moon clips and it's the shxt.
Rather have another .45 Winchester Magnum. Once you have the brass it only costs a tiny bit more to reload than .45 ACP, unlike the other super-duper magnum cartridges, and you probably already have all the componants to do it.
Instead of buying the 7 shot .357 1911, I would FAR rather have the 16 round 10mm 1911.