I've never owned a "new" Model 27, but I have owned a couple of "new" (with the lock) 44's and 45's. No, they might not be as nice as the older ones, but they were a long way from bad. I eventually sold them off to fund other purchases, but not because I was disatisified with the guns in any way.
I would say to get an older one, but only because I suspect they'd be less expensive.
For God so loved the world, that He gave His only begotten Son, that whoever believes in Him should not perish, but have everlasting life.
John 3:16 (NKJV)