I'm not a Ruger fan...and while I think they are ok, they're pretty far down the list of acceptable in the 1911 world in my opinion ......but I really have to disagree on Rock Island, nothing Rock Island makes has an inkling of quality in it - they're just junk.
I think around $1,000 Colt is making some very solid mid grade guns .... / ..I think one of the best guns for the money out there is Springfield TRP with a lot of features many shooters like - ambi safeties, mag well, checkered front strap for around $1,500. To me, Sigs 1911's are in the mix with Colt & Springfield.
Part of looking at 1911's is figuring out what features you want in a gun... .45 acp or 9mm / 4" - 5" barrels, bull barrels or a bushing, ambi safety, mag well, bob tail, type of sights, checkered front & back straps, cocking serrations front or back of slide - or both...internal or external extractors....etc.../ ..its not just about picking a Colt or Sig...
For my money, Wilson Combat makes the best 1911's on the market - but you are quickly into $3,000 - $4,000 prices even on their entry level guns like his CQB model.